I looked at myself in the mirror and thought "oh man, you are really getting old...our face is full of wrinkles!"
Is this sentence ok, please?
Not necessarily. He is looking into the mirror at an image of himself and is talking to that reflective image. Both faces (really one) show wrinkles. So "our" could be used - and it is a cute comment.
But I have to admit, I usually look in the mirror and say, "You are getting old, Susie!"
Nowadays when I look in the mirror, that's not me staring back. It's someone else, much older. I don'[t know that person. She is getting wrinkles
Or leads a double life.