Network television in the us is obsessed with youth. At least that's part of the reason anchor Ted Koppel offers for making a break after putting in more than 40 years on the platform. Koppel points to the increasing focus on younger viewers - hence talk of replacing Nightline with The Late Show with David Letterman - and to the fact that he didn't feel story selection should be done on the basis of trying to appeal to a younger demo. abc's loss, however, is Discovery's gain.

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