1 THE DEMOGRAPHY OF POPULATION AGEING Barry Mirkin and Mary Beth Weinberger* An inevitable consequence of the demographic transition and the shift to lower fertility and mortality has been the evolution in the age structure of the world population. Many societies, especially in the more developed regions, have already attained older population age structures than have ever been seen in the past. Many developing countries in the midst of the demographic transition are experiencing rapid shifts in the relative numbers of children, working-age population and older persons. DEMOGRAPHIC ASPECTS The number of persons aged 6 years or older in the world is estimated to be 65 million in 2. This number is projected to grow to nearly 2 billion by 25, at which time it will be as large as the population of children (-14 years). This historic crossover of an increasing share of older persons and a declining share of children will mark the first time that the number of children and older persons are the same. Persons aged 6 or older currently comprise 1 per cent of the world population (see table 1). The percentage is much higher in the more developed regions (2 per cent) than in the less developed regions (8 per cent), which are at an earlier stage of the demographic transition. It is especially low in the least developed countries (5 per cent). Among individual countries, the most aged are Greece and Italy, where 24 per cent of the population is aged 6 or older in 2. Many European countries, as well as Japan, have percentages nearly as high. By 25, the older ages will make up a projected 22 per cent of the world population 33 per cent in the more developed regions, 21 per cent in the less developed regions and 12 per cent in the least developed countries. (TABLE 1 HERE) In terms of major regions, the majority of the world s older persons (53 per cent) reside in Asia, while Europe has the next largest share, 24 per cent (see table 2 and figure I). Asia s share of the older population will increase to 63 per cent by 25, while the share of Europe will show the greatest relative decrease of any region, shrinking from 24 per cent to 11 per cent. *Population Division, United Nations Secretariat. 41
2 (TABLE 2 HERE) (FIGURE I HERE) The oldest old, persons aged 8 years or older, currently number 7 million, the majority of whom live in more developed regions. Thirty-three million are estimated to be living in less developed regions. They make up about 1 per cent of the world s population and 3 per cent of the population of the more developed regions. This oldest age group is the fastest growing segment of the older population. By 25, the number of the oldest old is projected to be five times as large as at present. By that date, the oldest old will be 4 per cent of the total world population, and in the more developed regions, one person out of 11 is projected to be aged 8 or older. In the less developed regions, 3 per cent of the population will be 8 years or older. It is necessary to look beyond 25 to see the full consequences for population ageing of ongoing trends towards lower fertility and mortality rates. A range of alternative scenarios presented in the United Nations long-range population projections (United Nations, 1999a) show that future populations will reach a significantly older age structure than the populations of the present, or even of the populations of 25. Figure II shows projected trends in the proportion of the world s population aged 6 or older through the year 215, from the medium fertility scenario, which assumes that fertility in all major areas will stabilize at replacement level around 25, and that mortality rates will continue to improve. By 215, persons aged 6 or older are projected to number 3. billion, nearly one person out of every three alive at that time. Over 1.2 billion people, or one in every 1 persons, will be aged 8 or older. Only 18 per cent of the population will be children aged under 15 years, as compared to 3 per cent at present. (FIGURE II HERE) Speed of ageing The growth of the older population often receives attention in connection with the developed countries. However, the tempo of ageing is more rapid in the less developed regions than in the more developed regions (see figure III). Because rapid changes in age structure may be more difficult for societies to adjust to than change that is spread over a longer time horizon, the speed of population ageing has important implications for government policies, such as pension schemes, health care and economic growth. Figure IV shows, for selected countries, the dates when the population reached, or is expected to reach, the point when 7, 14 and 21 per cent of the population was aged 65 or older. (Currently, 6.9 per cent of the world s population is aged 65 or older.) Typically, the transition from 7 to 14 per cent took longer for countries that reached the 7 per cent 42
3 level at an earlier date. For example, France and Sweden, which reached the 7 per cent point before 19, took 114 years and 82 years, respectively, to reach 14 per cent. That same transition required only 24 years in Japan, from 197 to Several developing countries shown in figure IV will also make a rapid transition from 7 to 14 per cent aged 65 or older. Brazil, Indonesia, the Republic of Korea and Tunisia are projected to make this transition in a time-span of under 25 years, and the two most populous countries, China and India, may require only 25 and 28 years, respectively. (FIGURE III HERE) In many cases, it will take substantially less time for the transition from 14 to 21 per cent aged 65 years or older than it took to move from 7 to 14 per cent (see figure IV). Although no country has yet reached the point where 21 per cent of the population is aged 65 or older, some countries, including Italy and Japan, are expected to reach that point before 215; in Japan, the transition from 14 to 21 per cent will have taken only 16 years, and in Italy, 23 years. At a later date, Canada and the United States of America are also expected to make a rapid transition from 14 to 21 per cent aged 65 or older as the large baby boom cohorts enter the higher ages. Thus, in the near future, some societies will be faced not only with older populations than have ever existed at the national level, but also with populations that are ageing at an extremely rapid pace. (FIGURE IV HERE) Ageing and gender Population ageing is, in basic demographic respects, not gender-neutral. The evolution to an older age structure changes the balance in numbers of men and women in the whole population. Men s higher mortality over the life course means that women typically outnumber men at older ages, and the difference is quite large among the oldest old (see table 3). At ages 6 or older, there were an estimated 81 men for every 1 women globally in 2, and at ages 8 or older there were only 53 men for every 1 women. The sex ratios of older age groups are lower in the more developed regions than in the less developed regions, since there are larger differences in life expectancy between the sexes in the more developed regions. In addition, the sex ratio in the oldest age groups in the more developed regions retains the effect of the heavy loss of males in some countries during the Second World War. (TABLE 3 HERE) Given the age patterns of the sex ratio, the rapid growth of the elderly population and the increase in the proportion in older age groups imply a decrease in the sex ratio for the total population and a greater increase 43
4 in the number of older women than of older men. Projected increases between 2 and 25 in the number of persons aged 6 or older are 636 million for men and 729 million for women in the world as a whole. Projected increases during the same period in the number of persons aged 8 or older are 116 million for men and 185 million for women. Concomitant with dramatic improvements in average lifespan has been the widening differential over time between male and female longevity. By , the female advantage in life expectancy at birth has grown to almost eight years in more developed regions and three years in less developed regions. The advantage, however, diminishes during the life course and by age 6, the male-female differential has narrowed to four years in more developed regions and to only two years in less developed regions. At current mortality rates (for ), almost 4 per cent of girls and about one quarter of boys born can expect to survive to the oldest old ages, 8 years or older. While the increased likelihood of surviving to older ages is obviously due to mortality declines at younger ages, recent decades have also seen significant mortality improvements among the older population, including the oldest old, and these trends so far have been more beneficial to women than to men (Kannisto, 1994). At older ages, women are less likely to be married and more likely to be widowed than are men, not only because they survive on average to higher ages, but also because most women marry men several years older than themselves. While more than three quarters (79 per cent) of older men are married, on a global basis, less than one half (43 per cent) of older women are married (United Nations, 1999b). The longer-term effect of gender differences in marriage age on later widowhood is only one of many ways in which demographic, as well as economic and social circumstances in early life have diverging ramifications for men and women in old age. Demographic causes of population ageing The process of population ageing is determined primarily by trends in fertility rates and secondarily by mortality rates. Any population with a long history of high fertility has a young age structure, similar in its general features to the present age structure for the group of least developed countries (see figure V). The average age of the population starts to rise when fertility rates decline. For the period , 61 countries in the world, representing 44 per cent of the world s population, are at or below replacement fertility. By 215, the world s population is projected to reach 7.2 billion, of which about two thirds will be living in countries at or below replacement fertility (United Nations, 1999c). The impact of mortality decline is more variable, depending on whether the decline in mortality operates mainly at younger or at older ages. In fact, the first stages of mortality decline have usually particularly benefited infants and children, and have often served to make the population younger. However, changes in mortality may assume a greater importance for 44
5 population ageing later in the demographic transition. In countries where mortality rates at young ages are already low, further declines have tended to affect mainly the adult and older ages, and have contributed to population ageing. For example, Caselli and Vallin (199) have demonstrated the growing impact of mortality change in population projections of France and Italy. They concluded that even if Italian fertility remained at a very low level of 1.4 children per woman through the year 24, more than half the increase in the proportion of the population aged 6 or older would be due to mortality change, and less than half to the earlier fertility trends. (FIGURE V HERE) Trends in dependency ratios Demographic dependency ratios are used as approximate indicators of the relative sizes of the nonworking-age and working-age populations. The youth-dependency ratio (the number of children per 1 persons of labour force age, ages years) and the elderly-dependency ratio (the number aged 65 years or older per 1 persons of labour force age) indicate the dependency burden on workers and how the type of dependency shifts from children to older persons during the demographic transition. The potential economic implications of falling or rising burdens of demographic dependency have been an area of active research. Since 197, the youth-dependency ratio has been declining in all regions, while the over-65 dependency ratio is rising (see table 4). Trends for the total ratio in different countries and regions depend upon the relative size and speed of these countervailing trends in the older and younger components. In general, the total dependency burden declined between 197 and 2. In the more developed regions, the total dependency ratio decreased over that period from 56 to 48 dependent-aged persons per 1 aged 15 to 64. The ratio will increase between the present and 225 and is projected to rise further, to 7, by 25. In the less developed regions, the overall dependency ratio in 197 was 84, much higher than in the more developed regions, but it decreased rapidly to 6 by 2, is projected to decline further to 5 by 225 and then to increase slightly between 225 and 25. The impact of demographic ageing is clearly visible in the old-age dependency ratio, which is increasing in both more and less developed regions during the period from 197 to 25. Between 2 and 25, the old-age dependency ratio will double in more developed regions and almost triple in less developed regions. (TABLE 4 HERE) The amount and pace of change in demographic dependency ratios varies greatly between countries. Large swings in dependency ratios are typically initiated or accentuated by rapid fertility declines, but those 45
6 effects take many years to play out. Four examples are shown in figure VI to illustrate a range of situations and trends: Argentina has experienced a gradual fertility decline, with relatively minor fluctuations over a long period. It is projected to experience only minor changes in the total dependency ratio, which will remain near 6 over the entire period from 197 to 25. In Italy, the total fertility rate plummeted after the mid-197s to reach the unprecedentedly low level of 1.2 by the early 199s. The total dependency ratio initially declined, but increases in the over-65 dependency ratio will dominate the trend into the future, and will produce an especially rapid rise in demographic dependency after 22. The Republic of Korea experienced a rapid fertility decline after 197, and the total dependency ratio fell to an unusually low level of 39 by 2. The overall ratio will not begin to rise appreciably until after 215, but it will then increase rapidly. Kenya shows an extremely high child-dependency ratio, with a total dependency ratio of 115 in 198. Kenya had one of the highest levels of fertility in the world, estimated at 8.1 children per woman during the period from 196 to 198, before beginning a rapid fertility decline, which is projected to continue. By 2, Kenya s under-15 and over-65 ratios were similar to those seen in the Republic of Korea 3 years earlier. (FIGURE VI HERE) Urbanization Consistent with the global trend of urbanization, the older population is becoming more concentrated in urban areas. By 2, the majority of the world s older persons (51 per cent) will live in urban areas; by 225, this is expected to climb to 62 per cent of older persons (United Nations, 1993). These figures, however, mask the large divergence between more and less developed regions. In the more developed regions, 74 per cent of older persons are urban dwellers, while in the less developed regions, which remain predominantly rural, slightly more than one third (37 per cent) of the elderly reside in urban areas. Despite the increasing urbanization of the older population, rural areas remain disproportionately older than urban areas in many countries as a result of migration of young persons to urban areas and the return migration of older persons to rural areas (Martin and Kinsella, 1994). 46
7 CONCLUSIONS There can be little doubt that changes in age distribution have complex social and economic implications at the societal and individual levels. An excess supply of workers could for instance turn into an acute shortage of new entrants within a few years. Likewise, the departure of older workers from the labour force is a source of serious pressure on national economies through its impact on pension schemes. An important issue is the question of how best to allocate limited resources among public sectors. Accordingly, planning may have to reflect greater sensitivity to expected demographic changes. This is especially important in the light of an increasingly competitive and integrated international economic environment, as well as a re-examination of the limitations of the welfare state. Conventional wisdom is that if change is slow, countries can more easily adapt. As the experience of developed countries has shown, despite an ageing process that has occurred over many years, adjustment to the challenges posed by population ageing has not been smooth. Given that large shifts in age structure are being compressed into a relatively short period in developing countries, these countries will have less time than the developed countries to adapt to the problems posed by the changing age structure. On the individual level, the goal is to enable older persons to maintain their dignity, self-esteem and physical and mental well-being in order to facilitate their continued participation in society and recognize their valuable contribution to their families and communities. The challenge for countries and communities is to provide conditions that promote quality of life and enhance the ability of older persons to work and live independently as long as possible. 47
8 REFERENCES Caselli, Graziella and Jacques Vallin (199). Mortality and population ageing. European Journal of Population, (Amsterdam, Netherlands), vol. 6, No. 1, pp Kannisto, Vaino (1994). Development of Oldest-Old Mortality, : Evidence from 28 Developed Countries. Odense, Denmark: Odense University Press. Martin, Linda and Kevin Kinsella (1994). Research on the demography of aging in developing countries. In: Demography of Aging, Linda Martin and Samuel Preston, eds. Washington, D.C.: National Academy Press. United Nations (1993). Urban and rural areas by sex and age: the 1992 revision. ESA/P/WP/12. (1999a). Long-range world population projections, based on the 1998 revision. ESA/P/WP/153. (1999b). Population Ageing, Sales No. E.99.XIII.11. (1999c). World Population Prospects: The 1998 Revision, vol. II, Sex and Age. Sales No. E.99.XIII.8. United States Bureau of the Census (1992). An Aging World II. Washington, D.C.: Government Printing Office. International population reports, P95/
9 TABLE 1. ESTIMATED AND PROJECTED PERCENTAGE OF THE POPULATION IN SELECTED AGE GROUPS, BY REGION Region Children: under age 15 World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Youth: ages World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Older persons: ages 6 or over World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Oldest old: ages 8 or over World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
10 TABLE 2. ESTIMATED AND PROJECTED REGIONAL DISTRIBUTION OF THE POPULATION AGED UNDER 15 YEARS AND THE POPULATION AGED 6 YEARS OR OVER - 197, 2 AND 25 (Percentage) Under age 15 Aged 6 or over Region World total More developed regions Less developed regions Least developed countries Africa Asia Eastern Asia China South-eastern Asia South Central Asia India Western Asia Europe Latin America and the Caribbean Northern America Oceania Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
11 TABLE 3. SEX RATIOS BY AGE IN THE MORE AND LESS DEVELOPED REGIONS, 2 (Men per 1 women) More Less developed developed Age World regions regions For broad age groups Total < For 5-year groups, ages 6 or over Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8).
12 TABLE 4. TRENDS IN AGE-DEPENDENCY RATIOS, BY REGION-197 TO 25 (Percentage) Region Dependency ratio: total World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Under age 15 World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Ages 65 or over World total More developed regions Less developed regions Least developed countries Africa Asia Europe Latin America and the Caribbean Northern America Oceania Note: The ratios show the ratio of the numbers of persons aged under 15 years and over 65 years to the number aged 15 to 64 years, expressed as a percentage. Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
13 Figure I. Geographic distribution of the population aged under 15 and 6 or over, 2 and 25 Under age 15 in 2 (1,8 million) Ages 6+ in 2 (65 million) Asia (61%) Africa (19%) Asia (53%) Europe (7%) Oceania (.4%) Northern America (4%) Latin America and the Caribbean (9%) Europe (24%) Africa (6%) Oceania (1%) Northern America (8%) Latin America and the Caribbean (7%) Under age 15 in 25 (1,746 million) Ages 6+ in 25 (1,97 million) Asia (57%) Africa (24%) Asia (63%) Africa (11%) Europe (5%) Oceania (.5%) Northern America (4%) Latin America and the Caribbean (9%) Europe (11%) Oceania (1%) Northern America (6%) Latin America and the Caribbean (9%) Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
14 Figure II. Percentage of world population by age group, medium scenario, Percentage Source: Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat, Long-range world population projections, based on the 1998 revision (ESA/P/WP.153), 1999.
15 Figure III. Growth in population size and age-specific annual growth rates, for the child, youth and older populations, Number of people: Average annual growth rate of the population: 2 Child: under age 15 5 Child: under age 15 Population (millions) Percentage World More developed regions Less developed regions Least developed countries Period 2 Youth: years 5 Youth: years Population (millions) Percentage Period 2 Older: 6 years or over 5 Older: 6 years or over Population (millions) Percentage Period 4 Oldest old: 8 years or over 5 Oldest old: 8 years or over Population (millions) Percentage Period Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
16 Figure IV. Time when the percentage of the population aged 65 or over reached or will reach 7, 14 and 21 per cent: selected countries Japan United Kingdom Poland Hungary Italy Canada United States Australia Sweden France Tunisia Rep. of Korea Indonesia Brazil China India Argentina More developed regions Less developed regions Percentage 65 or over: Period from 7% to 14% Period from 14% to 21% Note: For countries where the percentage aged over 65 years will reach 21 per cent after 25, only the period between attainment of the 7 and 14 per cent points is shown. Sources: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8); United States Bureau of the Census, An Aging World II, International Population Reports, P95/92-3 (Washington, D.C., Government Printing Office, 1992).
17 Figure V. Population pyramids: age and sex distribution, 2 and 25 Age Age Age Age Males Percentage of population Percentage of population 2 Females Percentage of population Percentage of population World Males More developed regions Less developed regions Least developed countries Percentage of population Percentage of population 25 Females Percentage of population Percentage of population Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
18 Figure VI. Estimated and projected trends in age-dependency ratios in selected countries (Persons aged under 15 or over 65 years per 1 persons aged years) Argentina Italy Dependency ratio Total Under Kenya Republic of Korea Dependency ratio Source: The Sex and Age Distribution of the World Populations: the 1998 Revision, Volume II: Sex and Age (United Nations publication, Sales No. E.99.XIII.8), medium variant projections.
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2. Germany (a) Past trends While the total fertility rate increased steadily from 2.1 to 2.4 children per woman between 15-155 and 1-15, Germany experienced a continuous decline afterwards, to 1. children
CHAPTER 02 the demographic challenge Introduction Migration 14 2.1 Many assessments of Ireland s demographic profile emphasise the demographic dividend that we are currently experiencing. The demographic
PRESS RELEASE Embargoed until 12:00 PM, 11 March, 2009 WORLD POPULATION TO EXCEED 9 BILLION BY 2050: Developing Countries to Add 2.3 Billion Inhabitants with 1.1 Billion Aged Over 60 and 1.2 Billion of
Fertility in New Zealand 1 Introduction The rate of teenage childbearing in New Zealand is high by OECD standards. This has generated considerable interest and discussion among social researchers and policy
A demographic profile of Portsmouth s past 1801-2001 Summary Portsmouth has experienced profound changes to its demography over the last 200 years. The population of Portsmouth has increased by more than
Projections of the Size and Composition of the U.S. Population: to Population Estimates and Projections Current Population Reports By Sandra L. Colby and Jennifer M. Ortman Issued March 15 P25-1143 INTRODUCTION
Key Messages for the 2016 Asia-Pacific Human Development Report SHAPING THE FUTURE: HOW CHANGING DEMOGRAPHICS CAN POWER HUMAN DEVELOPMENT Asia-Pacific is in the midst of an historic demographic transition
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FRANCE Past trends Between 195 and 195, the total fertility rate in France remained above.7 children per woman, but later dropped by per cent, from.5 in 19-195 to 1.7 in 199-1995. During that period the
CA8 Annex 3 Annex 3 Population data: Current and potential service users This Annex sets out some of the key data we hold about the population, taken from the 2011 Census and categorised by protected characteristics.
A Profile of Child Marriage in Worldwide, more than 700 million women and girls alive today were married before their 18th birthday. n child brides are most likely found in rural areas and among the poorest
Occccaassi ioonnaal l PPool liccyy Brieef f SSeer rieess THE CHANGING DEMOGRAPHIC PROFILE OF RURAL AMERICA Annabel Kirschner, E. Helen Berry and Nina Glasgow Overview Age Rural Populations are increasingtly
Her Majesty the Queen in Right of Canada (2016) All rights reserved All requests for permission to reproduce this document or any part thereof shall be addressed to the Department of Finance Canada. Cette
Population Geography Unit Test (Version A) 1. If the world s population in 1995 was approximately 6 billion and was expected to reach 12 billion in 45 years, what is the term for this period of 45 years?
JAPAN Past trends The total fertility rate in Japan fell from 2.75 births per women in 195-1955 to 2.8 births in 1955-196. Total fertility remained at the near-replacement level between 196 and 1975, and
1. Age structure of population 7 1. Age structure of population Table 1.1: Basic characteristics of the age structure of population (on 31December) 1970 1980 1991 1992 1993 1994 1995 1996 1997 1998 1999
September 2004 Understanding the Demographic Dividend By John Ross A fresh reason for attending to fertility dynamics has emerged the demographic dividend. As fertility rates fall during the demographic