Do we say 'My age is 21'?
If people ask like 'what's your age?', do we say 'I'm 21' or 'My age is 21'?

Thank you!

Question

Do we say 'My age is 21'?
If people ask like 'what's your age?', do we say 'I'm 21' or 'My age is 21'?

Thank you!

Answer

I think you could say "I'm 21 years old".

Answer

Yes, it's fine. You can stop reading here! It's fine.

It is also fine to say "I'm twenty-one years old" or simply "I'm twenty-one."

To some extent, if you are answering a question you would take your cue from the question.
"What is your age?" 
"My age is twenty-one." or 
"I'm twenty-one." (less formal), or 
"I'm twenty-one years of age." (very formal).

"How old are you?"
"I'm twenty-one." or,
"I'm twenty-one years old." or, even just
"Twenty-one."

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