Based on the theory of demology, the types of population age structure are divided according to the different proportions of elderly population and young population.

• 按人口学理论，人口年龄结构的类型是依据老年人口或未成年人口在人口中的不同比例来划分的。人口年龄结构类型分为年轻型、成年型和老年型。