Going by his actual age, Williams might be a little long in the tooth but I do think he's capable of trimming up a little for the role and appearing youthful enough for it. The Joker is supposed to be a bit older than Batman, I believe. At any rate, I had read that IGN Filmforce interview with Williams a couple days ago and just thought to myself "My god...he gets it. I mean...REALLY gets it!", and I have no reservations about what kind of performance he could put out. I really do believe he could make The Joker come off as such a perversive, sick, twisted, sadistic, psychotic f**k that it would make Nicholson's interpretation seem sophmoric in comparison. I do like Bettany for the role as well, but I just have this feeling that Williams could put some meat in the role that might not get put there by another actor. There's a level of complexity and turned-in torture that Williams brings to these types of roles he's played in the past that plays really well. The man is definitely not a light-weight when it comes to his acting chops.
And bane, that manip you did is definitely proof that he could pull the look off, without a doubt.
jag