Presidents And Aging

It's pretty clear that being president of the U.S. makes a fellow age rapidly. About two years ago I posted this: The Aging of the President, along with this comparison photo.

Bush was 54 when he took office. If John McCain is elected he will be 72 -- and the oldest person ever to be elected to that office. If he actually survives four years of being the most powerful man in the world, what would he look like?