4.age
A:For heaven's sake,Tony!Don't be silly!Calm down and act your age!
B:If you were me,can you still be so cool and collected? (act one's age)
A:I think she lied about her age.She can't be less than 40 years old.
B:You're right.No amount of make-up could hide her age. (hide one's age)
A:It's illegal to sell cigarettes to children who are under age.
B:But some people still do that. (be under age)
A:This book is written in a style appropriate to the age of the children.
B:Great! I want to buy one for my son. (be appropriate to the age of the children)
A:He's mature for his age.
B:And besides,he's very quiet,considering his age. (be mature for one's age)
A:How old are you?
B:Don't ask about a person's age,especially a lady's age,because it's impolite. (ask about someone's age)
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