Mac Photo 2: how to age a photographic subject - the person, not the photo "look"

[VectorCat]

Any suggestions on how to age people in photos? I have a photo for a design which is nearly perfect, but the person in the photo looks a bit too young. It's also a side shot in bright sun, so...maybe not a lot of shadowing opportunity there.

Thank you for any clues.

[loukash]

Perhaps overlay a photo of an older person's face and gently blend the skin structure into the other photo.

[R C-R]

Since that is a very open-ended question that could involve any number of techniques & considerable artistic skill, it would be helpful if you could at least say what the approximate age of this person is, their gender, & how much you want to age them, like all the way from a pre-teen to an oldster or something less drastic.