Great actor, but looks like hell

I know that Mark Hamill is not 25 anymore, but what happened to him? I hardly recognized him when I saw him on "Criminal Minds." He gave an excellent performance, showing he can excel as a villain as well as a hero, but he looks like a heart attack waiting to happen. His agent needs to get him a nutritionalist and a personal trainer. It would be a shame for something to happen to him health-wise.