年龄的相关词汇：
    年龄 age
    年龄段 age bracket
    年龄特征 age characteristics
    同龄人 age-grade
    
    常见年龄的英语表达方法：
    他是20岁的年纪。
    He is twenty．
    He is twenty years old．
    He is a twenty-year-old man．
    He is aged twenty．
    He is at the age of twenty．
    He is twenty years of age．
    
    他五十多岁。
    He is in his fifties
    
    他还不满17岁
    He is barely ／nearly ／almost seventeen．
    He is not quite ／yet seventeen．
    He is just under seventeen．
    
    他快满十八岁了。
    He is getting on for eighteen．
    He is going on eighteen years old．
    He willbe eighteen years old．
    It will be his eighteenth birthday．
    
    他超过十八岁了。
    He is past eighteen．
    他十八岁过两个月了。
    He is two months past eighteen years old.

文章来源：华申留学网