RookieBatman said:
Seriously, I think he doesn't look a day over 50.
What Shatner and I have in common is we could both play men in our mid-50s. Unfortunately for me, I'm only 46.
As I and others have stated before, since Kirk is dead (this just in: Captain James T. Kirk is still dead) writing Shatner's Kirk into the film is such a big deal it would almost have to be the story itself.
So, if there is a really good reason for Shatner's Kirk to be in XI (REALLY GOOD, as in very important to the story, not a walk-on or simple narration or whatever), then I've never had a problem with just retconning that he ever died in the first place. And, I'm a strict "if it happened on TV or on screen it's canon" kind of guy.
Just screw it. That's the best way to write him in. Just ignore he died.