What is population aging?
Population aging is a shift in a society's age structure toward a higher share of older people. A society is commonly called aging when people aged 65 and over make up 7% or more of the population, aged at 14%, and super-aged at 20%. The 7% line comes from a 1956 United Nations report; the 14% and 20% lines became conventional later.
South Korea became an aging society in 2000 and an aged society in 2017, and the 65+ share passed 20% at the end of 2024. The speed is among the fastest in the world, putting pressure on pensions, health care and long-term care.
Why does it happen? The demographic transition
The demographic transition model, outlined by Warren Thompson (1929) and others, describes a move from high birth and death rates, to falling death rates and rapid growth, to falling birth rates, to low rates of both. In the final stage fewer children are born and people live longer, so the age structure becomes top-heavy.
Social theories of aging
- Disengagement theory (Cumming & Henry, 1961): withdrawal of older people from social roles, and society's release of them, is natural and mutually functional. It was widely criticized for justifying forced retirement.
- Activity theory (Havighurst and others): older people who stay active and keep social roles are more satisfied with life. It underpins senior employment, volunteering and lifelong learning policy.
- Continuity theory (Atchley, 1989): people adapt to aging by continuing earlier personality, habits and relationships; familiar patterns matter more than the amount of activity.
- Modernization theory (Cowgill & Holmes, 1972): health technology, new production technology, urbanization and mass education lower the social status of older people.
The psychological task of late life is described by Erikson as integrity versus despair, and the influence of family, community and institutions can be analyzed with ecological systems theory.
Economic and social effects
- Shrinking workforce: a smaller working-age population (15–64) can slow growth. Bloom and colleagues (2010) argued that higher labor participation and later retirement can offset much of this.
- Dependency burden: a rising old-age dependency ratio strains public pensions such as Korea's National Pension and health insurance.
- Old-age poverty and care: older people without enough income rely on basic livelihood security and basic pensions, while demand for dementia and long-term care grows.
- Regional imbalance: young people moving to cities accelerates aging and depopulation in rural areas.
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Criticism and debates
- A fixed threshold of 65 ignores gains in healthy life expectancy.
- Framing aging only as a crisis stigmatizes older people; "active aging" and the silver economy frame it as an opportunity.
- Disengagement and activity theories reduce the diversity of older people to a single pattern.
References
- Thompson, W. S. (1929). Population. American Journal of Sociology, 34(6), 959–975.
- Cumming, E., & Henry, W. E. (1961). Growing Old: The Process of Disengagement. New York: Basic Books.
- Havighurst, R. J. (1961). Successful aging. The Gerontologist, 1(1), 8–13.
- Cowgill, D. O., & Holmes, L. D. (Eds.). (1972). Aging and Modernization. New York: Appleton-Century-Crofts.
- Atchley, R. C. (1989). A continuity theory of normal aging. The Gerontologist, 29(2), 183–190.
- Bloom, D. E., Canning, D., & Fink, G. (2010). Implications of population ageing for economic growth. Oxford Review of Economic Policy, 26(4), 583–612.