2011年10月,由美国国立卫生院老龄研究所和世界卫生组织联合出版的报告《Global Health and Aging》

联合国《World Population Aging 2019》(Highlights

Some countries may grow old before they grow rich.

Many developed nations have had decades to adjust to their changing age structures. In contrast, many less developed countries are experiencing a rapid increase in the number and percentage of older people, often within a single generation.

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