In this photo provided by CBS, David Letterman, host of the “Late Show with David Letterman,” waves to the audience in New York on Thursday, April 3, 2014, after announcing that he will retire sometime in 2015. Letterman, who turns 67 next week, has the longest tenure of any late-night talk show host in U.S. television history, already marking 32 years since he created "Late Night" at NBC in 1982. (AP Photo/CBS, Jeffrey R. Staab) MANDATORY CREDIT, NO SALES, NO ARCHIVE, FOR NORTH AMERICAN USE ONLY
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