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Andy Rooney
David Letterman: How long can the TV talk host stay on the job?
David Letterman: How long can the TV talk host stay on the job?

Now that David Letterman has extended his deal with CBS through 2015, it's time to ask: How long can the onetime heir to Johnny Carson stay on the job?  Letterman, host of CBS' "Late Show," will turn 68 in 2015. Television executives strive to reach "the demo," or the demographic comprised of viewers ages 18 to 49. At 68, Letterman wouldn't just be outside the demo, he'd be at least as old as the fathers of most people inside it. As painful as it is for those of us who grew up on his old NBC late-night show to admit, this guy is your dad's TV host — at least if you're under 40.   Is that a horribly ageist thing to say? Maybe. But it's also realistic. Before you bury me under a mountain...

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