Of the 45 people who have served as president, 25 have become the oldest such individual of their time, with one, William Howard Taft, doing so twice. Herbert Hoover held the distinction for the longest period of any, from the death of Calvin Coolidge in January 1933 until his own death 31 years later. Lyndon B. Johnson held it for the shortest, from the death of Harry S. Truman in December 1972 until his own death only 27 days later. Theodore Roosevelt, at age 49, is the youngest individual to become the oldest living president; Jimmy Carter became the oldest to acquire the distinction at age 94. (Nine of these individuals have also had the distinction of being the oldest living U.S. vice president: John Adams, Martin Van Buren, Millard Fillmore, Andrew Johnson, Harry S. Truman, Lyndon B. Johnson, Richard Nixon, Gerald Ford, and George H. W. Bush.)