英语短文翻译 How old is "old"? The answer has changed over the yea

How old is “old”?The answer has changed over the years.Two hundred yesrs ago,you were old at 35.At the beginning of the 20th century,the average life span was 45.In 1950,70-year-olds were really old.Today,a healthy 70-year-old is still thought young.
多大岁数才算年老?这个答案已经改变很多年了.两百年前,35岁的时候,你就算老人了.在20世纪初,人的平均寿命是45岁.在1950年,70岁才算真正老.而今天,一个健康的70岁大的人仍然被认为是年轻人.