TABLE 3-5   Summary Indicators of Population Aging, 2010 and 2050

Indicator 2010 2050 Percent Change, 2010–2050
Aged 65+ (%) 13.0 21.3 64
ADR     .67     .84 26
OADR     .22     .39 81
RWR     .26     .45 71
SRU     .51     .47 −8
SRW     .78     .68 −12

SOURCES: Board of Trustees, Federal Old-Age and Survivors Insurance and Federal Disability Insurance Trust Funds (2011) and projections by the Committee.

and migration changes. In contrast, the life cycle calculations summarized in Figure 3-4 compensate only for rising life expectancy.

GLOBAL PATTERNS OF AGING

Population aging is occurring in most countries because life expectancy has risen and fertility has declined. Aging is most pronounced in high-income countries (i.e., Europe, North America, and Japan), where the median age of the population rose from 29 to 39 years between 1950 and 2010 (United Nations, 2011). United Nations projections expect this median to reach 48 years in 2050. Populations in the developing world (Asia excluding Japan, Latin America, and Africa) are generally younger, with

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FIGURE 3-15  Retirement age required to keep old-age dependency ratio constant at its 2010 level. SOURCES: Board of Trustees, Federal Old-Age and Survivors Insurance and Federal Disability Insurance Trust Funds (2011) and projections by the committee.



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