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This is a chronology of who was the oldest living President of the United States, former or current, at any given time. Herbert Hoover holds the record with 31 years spent as the oldest living U.S. President, followed by John Adams with 27 years, and Ronald Reagan with 23 years. Since the death of Gerald Ford on December 26, 2006, George H. W. Bush has been the oldest living U.S. president.

• All Presidents lost their title of oldest living United States President by dying, except for Theodore Roosevelt, William Howard Taft, and Richard Nixon, who each lost the title when an older man (Taft, Woodrow Wilson and Ronald Reagan, respectively) was inaugurated President. Nixon was the only one of the three to not lose the title to the President who immediately followed him.
• William Howard Taft was the only one to regain the title after losing it.
• The President who held the title of oldest living United States President for the longest span of time was Herbert Hoover, who held the title from the death of Calvin Coolidge on January 5, 1933 to his death on October 20, 1964, a span of 31 years, 10 months and 15 days. Incidentally, Hoover also holds the distinction of having the longest retirement of any United States President, at over 31 years, 7 months. Currently the United States President who has been retired the longest is Jimmy Carter, who will need to stay alive until September 9, 2012 to pass Hoover.
• The President who held the title of oldest living United States President for the shortest span of time was Lyndon Baines Johnson, who held the title from the death of Harry S. Truman on December 26, 1972 to his death on January 22, 1973, a span of 27 days.
• There have been six instances where the sitting United States President was the only living United States President. The six Presidents were George Washington, John Adams (following Washington's death), Ulysses S. Grant (following Andrew Johnson's death), Theodore Roosevelt (following Grover Cleveland's death), Herbert Hoover (following Calvin Coolidge's death) and Richard Nixon (following Lyndon Baines Johnson's death). Other than Washington, the longest any of them had to serve as the only living President was Grant, who served 1 year, 216 days alone.
• After George H. W. Bush, the order of age of the remaining living United States Presidents is Jimmy Carter (born October 1, 1924), George W. Bush (born July 6, 1946) and Bill Clinton (born August 19, 1946).

1. ^ ^{a b c} Did not die on this date. Older person was inaugurated President.

• List of United States Presidents by longevity
• List of United States Presidents by time as former president