"Population ageing is the 21st century's dominant demographic phenomenon”(Bloom & Luca, 2016,p.3-56) ,People for a lifetime couldn't avoid death and ageing.According to the above ,sentence we could know about human beings life must to experience ageing progress and pass away.Nowadays,the world population have been increasing too faster,therefore the experts are worried about the effects society medical resource and economic development.On the other ,hand we will discuss this effect and causes (Légaré, 2015).