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老龄化

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人口老龄化又称人口老化或人口高龄化、高齡化社會,是指因出生率降低和/或预期寿命延长导致年龄中位数增加的现象。大多数发达国家人口长寿,老龄人群变多;但发展中国家目前也出现类似现象。除了联合国确认的18个“人口异常”国家外,全世界普遍出现这一现象。现在,老龄人口为人类历史之最。(维基百科老龄化)

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