How old do you think Jasper is?
I personally think he's 30. Look at that receding hairline. His skin on that picture looks well tanned, more tan then an 18 year old could accomplish. It more looks like years of youth passed away very slowly, and remolded, shaped, tanned into what it is now. But the skin is like play dough, which you can remold something over and over again, but slowly over time it hardens, crusts, wrinkles, and can no longer hold its shape.
His chin, it is nice and square and manly. Tis the kind of chin that teenagers dream to have (or not). It attracts the ladies because of its manly smexiness, and thus you have his beautiful young girlfriend, who masks his age. He has drooping cheeks, and ears that have been affected by gravity to the point they are stretching downward toward the floor.
How old do you think he is?
edit: I_Agree is right.