Construction and Application of Dynamic Model for Optimal Retirement Age under Change in Population Age Structure:A Case of Shaanxi Province

With the basic premise of maximization in social welfare,this article set an assumption that the retirement age is the optimal average retirement age under the conditions of maximization in social welfare.Through establishing the dynamic model for optimal retirement age under change in population age structure and taking Shaanxi Province as an example,this paper has taken measurements and calculates of the optimal average retirement age in Shaanxi Province under the conditions of maximization in social welfare.From which,some conclusion can be drawn that the optimal average retirement age in Shaanxi Province will be from 58.4 in 2010 to 59.6 in 2020,finally up to 61.3 in 2030 under the conditions of maximization in social welfare.