how old +be 动词+主语?”

How old are you?

你多大了？

I’m twenty-one years old.

我21岁了。

John is not forty-five yet, is he?

约翰没有45岁，不是吗？

Mr. Smith is still in his fifties.

史密斯先生还五十来岁了。

I'm two years older than you are.

我比你大两岁。

My brother is two years younger than I am.

我的弟弟比我小两岁。