人口老龄化是21世纪的重大社会问题,是国际社会普遍关注的热点,也是我国社会、经济发展中带有全局性、战略性的问题。由于人口出生率的下降和平均预期寿命的延长,发生了世界范围的不可抗拒的人口老龄化。预计21世纪前半叶为老年人口绝对数快速增长期,目前北京市老年人数量已达178万,占全市人口总数的14.0％。预测2005年以后, The aging of population is a major social issue in the 21st century, a hot spot of general concern of the international community, and a global and strategic issue in our social and economic development. Due to the declining birth rate and the extension of average life expectancy, an irresistible population aging worldwide has occurred. It is estimated that the absolute number of elderly population will rapidly increase during the first half of the 21st century. At present, the number of elderly people in Beijing has reached 1.78 million, accounting for 14.0% of the total population of the city. After 2005 forecast,