title: Population aging model and its explanation.
authors.forename: X
authors.initials: X
authors.lastname: Qiao
mesh_terms: D001208:Asia; D002681:China; D003710:Demography; D003906:Developing Countries; D005202:Asia, Eastern; D005298:Fertility; D008962:Models, Theoretical; D009026:Mortality; D011153:Population; D011157:Population Dynamics; D012106:Research
keywords: Asia; China; Demographic Aging; Demographic Factors; Developing Countries; Eastern Asia; Fertility; Mathematical Model; Models, Theoretical; Mortality; Population; Population Dynamics; Research Methodology