Rummaging through some old posts, I came across something from this past January 20, which has a new context in light of the Palin pick (and performance) as a veep candidate, from CNN:

From CNN: "Chuck Norris brought his tough-guy approach to the campaign trail Sunday, taking aim at John McCain's age and suggesting the Arizona senator might not last even a single term. Norris, an ardent supporter of Mike Huckabee, told reporters he believes serving as president accelerates the aging process 3-to-1. 'If John takes over the presidency at 72 and he ages 3-to-1, how old will he be in four years? Eighty-four years old — and can he handle that kind of pressure in that job?' Norris said, as Huckabee looked on. 'That's why I didn't pick John to support, because I'm just afraid the vice president will wind up taking over his job within that four-year presidency.' added the action star."