中华医疗养生问答 Q & A on Healthy Living by Grandmaster Zhao Jin-Xiang

2． 人的生理寿命应该是多大岁数呢？

答：按着生物学的原理，哺乳动物的寿命是它的生长期的5倍至7倍。人的生长期是用最后一颗牙齿长出来的时间（20至25岁）来计算的。因此，人的寿命最短100岁，最长175岁，公认的人之寿命，正常应该是120岁。

2. What ought to be the biological age of human being?

Answer: In accordance to the theory of biology, mammals’ age are between 5 to 7 times their growth duration. The growth duration of human being is considered to end when the last tooth appears (20 to 25 years of age). Thus, the age of human being ought to be between 100 to 175 years. Commonly agreed normal age of human being is 120 years.