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人的平均寿命延长是好事,但老年人在人口中的比例增大,人口老龄化却成为一大社会问题。在工业化国家,人口老龄化趋势已越来越令人担忧。从65岁以上的老人占全部人口的比例来看,1970年日本为7.1％,美国为9.8％,英国为12.8％,估计到2025年,日本将高达20.3％,美国将高达17.2％,英国将高达18.7％。目前,工业化国家的人口平均年龄为29.25岁,到2025年将升高到34.5岁。据计算,第二次世界大战后出生率的高峰带来的人口增长的影响到2010年将结束,此后,人口老龄化速度将进一步加快。事实上,工业化国家的人口出生率自1970年就开始下降了,其中有的国家80年代已开始出现零增长。人口老龄化的一个直接影响是劳动人口供养的老
The average life expectancy of people is a good thing, but the proportion of the elderly in the population has increased, but population aging has become a major social issue. The trend of population aging has become increasingly alarming in industrialized countries. In terms of the proportion of the total population aged over 65, Japan was 7.1% in 1970, 9.8% in the United States and 12.8% in Britain. It is estimated that by 2025 Japan will be as high as 20.3% and the United States as high as 17.2%. Britain will Up to 18.7%. At present, the average age of the population in industrialized countries is 29.25 years old and will rise to 34.5 years by 2025. It is calculated that the impact of the population increase brought by the peak of the birth rate after the Second World War will come to an end in 2010 and the population aging rate will be further accelerated thereafter. In fact, the birth rate of the population in industrialized countries has declined since 1970, and some of them have begun to experience zero growth in the 1980s. A direct impact of the aging population is that of the working-age population