08/05/2009 05:12 am ET Updated May 25, 2011

Conan's "Tonight Show" Audience A Decade Younger Than Leno's

In Mr. O'Brien's first month as host, the median age of "Tonight Show" viewers has fallen by a decade -- to 45 from 55, a startling shift in such a short time. This audience composition means advertisers can now address almost exclusively young viewers on "Tonight," and NBC is already contemplating a shift in how it sells the show.

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