关键词: 人口年龄组, 实年组, 年轻老人, 高龄老人

Abstract: In this paper，we argue that the current standard age partition of populations into three broad age groups is difficult to capture the social-economic meaning of contemporary populations in the context of the extension of life expectancy，the enhancement of education of children and teenagers，the crude definition of adult age，and the changing social roles for older population. In this work，we try to divide population age into five groups according to a hundred-year life expectancy，and name each group correspondingly. The new partition which divides age groups equally not only makes statistical analysis and internal comparison easier，but also exactly conveys the life characteristics and social roles for each course of life，and thus can contribute to public policy adjustment. The demographic conditions are well under way for this age partition adjustment in both more developed countries and current China.

Keywords: Population Age Group , The Age Group of 60-79 , Younger Elderly , The Oldest-old