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随着社会经济的不断发展,人民物质生活水平和医疗保健事业水平的日益提高,人类期望寿命也正在不断提高,人口老龄化问题已成为当今世界上引人关注的重大社会问题。世界卫生组织发表的1997年
With the continuous development of the social economy and the ever-increasing levels of people’s material living standards and medical and health care undertakings, the life expectancy of human beings is constantly improving. The problem of aging population has become a major social issue attracting people’s attention in the world today. World Health Organization, 1997