James K. Polk was 49 years, four months and two days when he took office on March 4, 1845.
Franklin Pierce was 48 years, three months and 10 days when he took office on March 4, 1953.
Ulysses S. Grant was 46 years, 10 months and six days when he took office on March 4, 1869.
James Garfield was 49 years, three months and 14 days when he took office on March 4, 1881.
Theodore Roosevelt was 42 years, 10 months and five days when he took office on March 4, 1901. This makes him the youngest president to take office in American history.
John F. Kennedy was 43 years, 7 months and 19 days when he took office on January 20, 1961.
Bill Clinton was 46 years, 5 months and one day when he took office on January 20, 1993.
Barack Obama was 47 years, 5 months and 16 days when he took office on January 20, 2009.
Chat with our AI personalities
As of 2010, nine United States Presidents have been under the age of 50 at the time of their inauguration. In ascending order of age, these are:
John F. Kennedy, our youngest president, was 43 when elected President of the United States.
Actually, Theodore Roosevelt was only 42 when he took office in 1901, making him the youngest president in American history.
A term
None. The youngest President was Theodore Roosevelt who took office when he was 42 years of age.
American presidents who are re-elected are required to repeat the oath of office.
4 years
The Vice President of the United States shares the President's term of office. The President is elected along with the Vice President to serve 4 years.