Is he in his early 20s?为什么20后加s

Is he in his early 20s?为什么20后加s he is like his father 为什么like不加s he is like his father.为什么like不加s he is in his early in his early 30's Now he live in China with his parents中的live为什么不加s 请问什么叫Soothing Stress Away,什么是 iPod?还有如果说He is in his 20s. His mother is in hospityal .He is ________(s开头) in your early 20s 20s全写是什么? 翻译"He is in his late 30s" 英语翻译He is a tall man in his early forties.in his early forti 英语翻译He is a young man in his early twenties.