Well AJ is what? 32? And so far no-one in this thread has even remotely suggested Adam's age as being near that. Plus, if you look at movies he did like Wishcraft which was released 7 years ago, so he'd have been 25, but clean-shaven he looked about 17.
It's all about how that person plays the character I think.
There was debate when they released the new 90210 about a certain actor being let go cos he was too old to be playing a high-schooler. I personally felt that he was the last person I'd have levelled that accusation at. But maybe others saw it differently.