File photo of U.S. President Obama and former president Bush during the inauguration ceremony in Washington

 
File photo of U.S. President Obama and former president Bush during the inauguration ceremony in Washington
U.S. President Barack Obama (L) and former president George W. Bush are seen during the inauguration ceremony in Washington in this January 20, 2009 file photo. Judging by their "before" and "after" photographs, U.S. presidents appear to age before our eyes, adding wrinkles and gray hair with each year in office. But contrary to conventional wisdom, a few years in the White House do not appear to cut short the lives of U.S. presidents, and most live longer than their peers, according to a new study released on December 6, 2011. REUTERS/Kevin Lamarque/Files (UNITED STATES - Tags: POLITICS)