If John McCain wins the White House, he would become in January 2009, at 72, the oldest person ever sworn in as a first-term U.S. president.
Here is a look at the ages of some of the 43 U.S. presidents when they took office.
--George Washington, the first president, 57.
--Abraham Lincoln, immortalized as "the Great Emancipator" for freeing American slaves, 52.
--Theodore Roosevelt, the youngest president, 42.
--Franklin Roosevelt, a distant cousin of Theodore Roosevelt who led the nation to victory in World War Two, 51.
--John Kennedy, a charismatic leader assassinated in his third year in office, 43.
--Richard Nixon, snared in the Watergate political corruption scandal that forced him to resign, 56.
--Ronald Reagan, the oldest president, 69. When he completed a second term he was 77.
--George H.W. Bush, father of President George W. Bush, 64.
--Bill Clinton, who reigned over peace and prosperity even as he was caught having an affair with a White House intern, 46.
--George W. Bush, whose popularity eroded with the Iraq war, 54.