A comprehensive study on the age structure.
Yan
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D017677:Age Distribution; D000367:Age Factors; D001208:Asia; D002681:China; D003710:Demography; D003906:Developing Countries; D005202:Asia, Eastern; D008962:Models, Theoretical; D011153:Population; D011154:Population Characteristics; D012106:Research
Age Distribution; Age Factors; Asia; China; Demographic Factors; Developing Countries; Eastern Asia; Models, Theoretical; Population; Population Characteristics; Research Methodology