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In French, to express how old someone is you use "avoir [nombre] ans".
How to say how old you are in French
Look at these examples expressing age:
informal:
formal:
Note that to say how old someone is in French, we use avoir + age + ans.
Effectively we say I have fifteen years, not I am fifteen.
ATTENTION:
In French, you cannot omit ans as it wouldn't make sense. J'ai quinze simply means I have fifteen (fifteen what?)
To ask someone's age:
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