Young?
It's probably the wig / dyed hair (I don't really care which) that makes him look 'young', along with dressing well, a make-up dept to conceal the cracks, an enjoyable job, ample amounts of cash, and a young lady to mess about with, etc.
I assume he has considered how much 'electro-smog' is floating about in the studio, with all those wireless mics and cams?
I admit I still find him quite amiable on Deal or No Deal, so I'm not going to let a bit of hippy nonsense cloud my opinion of him too much! (although, if I thought about it too deeply, I could be quite disgusted how he lets contestants make expensive mistakes based upon numerical hunches that are total BS - it's RANDOM!)