Already, nearly half the world’s population lives in countries with
birthrates below the replacement level. According to the Census Bureau,
the total increase in global manpower between 2010 and 2030 will be just
half the increase we experienced in the two decades that just ended. At
the same time, according to work by the International Institute of
Applied Systems Analysis, the growth in educational attainment around
the world is slowing.
This leads to what the writer Philip Longman has called the gray tsunami — a situation in which huge shares of the population are over 60 and small shares are under 30.
as reported in the NY Times
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