here is how I calculate

來源: noso 於 2012-01-20 13:47:47 [檔案] [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次 (138 bytes)

回答: 幾歲開始算中年？35？40？由 pigletto 於 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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