1) use of be
We most often talk about people's ages with be+ number.
He is thirty, (not Hc has thirty=) or be + number + years old (more formal... of age).
He is thirty years old/of age (not ... thirty-years.)
We ask How old are you?, not normally What is your age?
2) be +... age
Note the structure be+ ... age (without a preposition).
When I was your age I was working, (not Whcn-twas at your age...) The two boys are the same age. She's the same age as me.
3) prepositions
In other structures, at is common before age.
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