Article Two of the United States Constitution provides that U.S. presidents must be at least 35 years old at the time they take office. The
median age at inauguration of incoming U.S. presidents is 55 years. The youngest person to become U.S. president was
Theodore Roosevelt at age 42, who
succeeded to the office after the
assassination of William McKinley.
John F. Kennedy was the youngest person elected as president, at age 43;
assassinated at age 46, he was also the youngest president at the end of his tenure, and his lifespan was the shortest of any president. The oldest president at the end of his tenure is
Joe Biden at age 82 years, 2 months.
Jimmy Carter had the longest lifespan of any president, becoming the first president to
reach the age of 100.
James K. Polk had the shortest retirement of any president, dying of
cholera only days after leaving office, at age 53, and the youngest to die of natural causes. Carter's retirement at , is the longest in American presidential history. Biden is the oldest of the five living U.S. presidents, at . ==Presidential age-related data==