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世界人口正在加速老龄化。２０世纪后半叶的生育率下降和预期寿命的稳定增长导致了世界老年人口的急剧增长。６５岁及以上人口占世界总人口的比例比以往任何时候都高，并且在２１世纪还将继续增高。这种趋势对于许多国家都具有极其重要的影响，因为它将潜在加重现存老年社会供
The world’s population is accelerating aging. The declining birth rate and steady growth in life expectancy in the second half of the 20th century led to a dramatic increase in the world’s elderly population. The proportion of people aged 65 and over in the world’s population is higher than ever before and will continue to rise in the 21st century. This trend has an extremely important impact on many countries, as it will potentially aggravate the existing social supply of older persons