Age of presidents The youngest to become president by election was John F. KennedyJohn F. KennedyKennedy was the first Catholic elected president. Kennedy's administration included high tensions with communist states in the Cold War. As a result, he increased the number of American military advisers in South Vietnam. The Strategic Hamlet Program began in Vietnam during his presidency.https://en.wikipedia.org › wiki › John_F._KennedyJohn F. Kennedy - Wikipedia, who was inaugurated at age 43. The oldest person to assume the presidency was Joe Biden, who took the presidential oath of office two months after turning 78.
Who was the youngest president of the United States?