自50年代以来,许多死亡率总体水平较低的国家80岁及以上高龄老人死亡率的下降速度与幅度大大高于所有其他年龄组,加上过去高出生率期间出生的人群陆续进入高龄,80岁及以上高龄老人是21世纪老年人群中增长最快的年龄组。第四次全国人口普查表明,中国1990年高龄老人人数为800万。在比较保守的中死亡率预测方案下(即假定中国男、女平均0岁预期寿命从1990年 Since the 1950s, the mortality rates of many elderly people aged 80 and over in many countries with relatively low overall mortality rates have been declining at a much faster rate and by a larger margin than all other age groups. In addition, those born during the previous high birth rates have gradually entered the age group of 80 And above The elderly are the fastest growing age groups in the 21st century. The fourth national census shows that the number of elderly people in China in 1990 was 8 million. Under the more conservative medium mortality projections (assuming that the average age of men and women in China is 0 years of life expectancy from 1990