Celeb Old Dads and Their Young Children

David Letterman and his wife, Regina arrive for a dinner for Kennedy honorees hosted by U.S. Secretary of State Hillary Rodham Clinton at the U.S. Department of State, Dec. 1, 2012, in Washington, DC. They have a 9-year-old son, Harry Joseph Letterman, who was born when Letterman was 56. (Ron Sachs/Getty Images)