我们以 65 岁以上 人口数除以 20 至 64 岁的人口数来计算老年抚养比（Old-age dependency ratio），世界平 均水平从 1950 年每百人抚养 10 个老年人上升到 2010 年的 13.4。
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而有关国民年金部份，由于老年依赖比率(old-age dependency ratio)预期在近几年内会急速增加，又由于国民保险年金的财务处理方法系透过随收随付的方式运作。
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old age dependency ratio 扶老比
When a country is ageing (median age above 40), it again has a high dependency ratio, this time because of old people.
而当一个国家趋向老迈时(中位年龄在40岁以上)，依赖性比例仍然高，这是因为老人多的原故。
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That means China's old-age dependency ratio (which compares the number of people over 65 with those aged 15 to 64) will soar.
ECONOMIST: Demography
Its dependency ratio the proportion of children and old people to working-age adults is one of the best in the world and will remain so for a generation.
ECONOMIST: India's economy
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