Reagan was already old when he went into the presidency. I think he was 68 or 69 when he took office. I think after you reach a certain age, you just can't look any older. Plus he had the magic of Grecian Formula 44 working for him. WIthout that? Methuselah, man.
EDIT: Dole, you clever nipper.
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"If honesty is the best policy, then, by elimination, dishonesty is the second-best policy. Second is not all that bad."
-George Carlin