The current development of the cause of aging is based upon the demography of aging analysis focusing on the perspective of age and dynamic observation of the proportion of population. Aging demographic researches in 2012 show that spatial dimensions, gender dimensions and other relevant factors of age dimension are typical angle of view in observing demographic dynamics as well. Multi-dimension observation is beneficial to the development of the cause of aging and aging policy-making. The rapid aging of population in 21st century offers a broad prospect to develop the cause of aging, whereas the risk of over aging challenges such development. <<