终其天年

Explanation: End all, the best. Later years that the number of natural life. Life expectancy should have been completed. Hospice means long life. 　　Source: "Zhuangzi Hill Wood" Yet this position was the end of this wood to its natural life span. "" Huainanzi spiritual training "Yu exterminate the heart, although the situation, shape of the bent exhaust, still forced to self-improvement as well. Therefore, the end of their natural life span monensin."