here is how I calculate

来源: noso 于 2012-01-20 13:47:47 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (138 bytes)
回答: 几岁开始算中年？35？40？ 由 pigletto 于 2012-01-20 13:22:38

let's say with good health normal people can live up to 90 years old. Devided by 2, 45 is middle age.

 

 

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