Who Is the Youngest President
The youngest person to serve as U.S. president was Theodore Roosevelt, who assumed office at age 42 following the assassination of William McKinley in 1901.
Youngest President by Age at Inauguration
The youngest elected president was John F. Kennedy, who was 43 years old when inaugurated in 1961. Roosevelt was younger when he took office, but he was not elected to the presidency first at that age.
Key Facts and Historical Context
Presidential age requirements are set by the U.S. Constitution, which mandates a minimum age of 35. Roosevelt’s rise to the presidency came after McKinley’s death, while Kennedy won the office at a historically young age. For more details on U.S. presidential history, see the official White House records.
