1. He is my age.

2. He is the same age as I am.
3. He and I are of the same age.

Are they all the same? Do you have other similar expessions?

3 answers

They are all the same, except I'd leave out "of" in the third one.

You could also say, "We are the same age."
Thank you.
How about this one: He is as old as I am.
It's perfect.