According to legend, Lao Zi lived a long life and died in the State of Qin in the fifth year of Zhou Yuanwang (47 1 BC) at the age of10/year. "Zhuangzi Master of Health" has a cloud: "Death, Qin lost, out of three." Hu Shi believes that Lao Tzu lived for more than ninety years at most.

Laozi, whose real name is Li Minger, whose name is Bo Yang, or Bo Yang, was born in the late Spring and Autumn Period, and his date of birth and death is unknown. According to historical records and many other ancient books, Laozi was born in the ancient county of Chen in the Spring and Autumn Period.