NBC's rationale in replacing Jay Leno with Jimmy Fallon was to increase the number of younger viewers, early reports had said. How to explain, then, that Leno beat each of his rivals during the May sweeps by big margins, including his ratings in the key 18-49 and 18-34 age groups? According to Nielsen figures released over the weekend, Leno's Tonight show averaged 250,000 more viewers than ABC's Jimmy Kimmel Live and 325,000 more than CBS's Late Show with David Letterman. Among total viewers, Leon averaged 3.5 million in May versus 2.8 million for Late Show and 2.5 million for Kimmel. Citing the sweeps figures, New York Post columnist Michael Starr commented: Question to NBC: are you sure you wanna replace Jay Leno? Leno is due to step down during the week leading up to the 2014 Winter Olympics which start February 6th. Jimmy Fallon is scheduled to replace him during the second week of the Sochi games.