(1) sixteen years old (2) sixteen-year-old (3) 16/sixteen 三个意思上都没有分别,但(1)(2)比较正式；(3)比较非正式,较常在日常生活中使用. 如果是介绍一个人,那就说: (1) He is sixteen years old. (2) He is sixteen-year-old. (3) He is 16./ He is sixteen. 要说自己,把 [He is] 换成 [I am] 就可以了 再问： 太给力了，你的回答完美解决了我的问题！ 再答： 不客气~
