List of presidents of the United States by age
The median age upon accession to the presidency is 55 years and 3 months. This is how old Lyndon B. Johnson was at the time of his inauguration. The youngest person to assume the office was Theodore Roosevelt, who became president at the age of , following William McKinley's assassination; the oldest was Donald Trump, who was old at his inauguration. The youngest person to be elected president was John F. Kennedy, at of age on election day; the oldest was Ronald Reagan, who was old at the time of his election to a second term.
Presidency of John F. Kennedy
Kennedy was assassinated in November 1963 while visiting Dallas, Texas. Though the Warren Commission concluded that Lee Harvey Oswald acted alone in assassinating Kennedy, Kennedy's death gave rise to various conspiracy theories. Kennedy was the first Roman Catholic to serve as President of the United States, as well as the youngest individual ever to win a U.S. presidential election. Historians and political scientists tend to rank Kennedy as an above-average president.