http://www.salon.com/politics/war_room/2007/09/28/number/print.html

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Tim Grieve
Sep. 28, 2007 | 116 million: The number of Americans -- 40 percent of the U.S. population -- for whom the president has always been named Clinton or Bush.
Correction: As readers have noted, the Associated Press article referenced here refers not to a Bush or a Clinton being president but a Bush or a Clinton being "in the White House," which means that the number includes those Americans who were born when George H.W. Bush was serving as Ronald Reagan's vice president.
-- Tim Grieve