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整个人类目前正第一次在变老。本世纪初出现了人口的老化问题,这种趋势将要持续到下个世纪中叶。那时人类的年龄结构将达到稳定状态,人的寿命将达到实际限度, 人类已经感觉到人口变化所产生的影响。1900年,65岁以上的人口为1000万至1700万,占人口总数不到1%。而到了1992年,65岁以上的人口为3.42亿,占人口总数的6.2%。到2050年,65岁以上的人口数目至少将达到25亿,约占那时世界人口总数的1/5。
For the first time, the entire human race is getting older. The aging of the population has emerged at the beginning of this century and this trend will continue until the middle of the next century. At that time, the age structure of mankind will reach a steady state, and the life expectancy of mankind will reach the practical limit. Mankind already feels the impact of population changes. In 1900, the population over the age of 65 was 10 million to 17 million, accounting for less than 1% of the total population. By 1992, the number of people over the age of 65 was 342 million, accounting for 6.2% of the total population. By 2050, the population over the age of 65 will reach at least 2.5 billion, or about 1/5 of the world’s population at the time.