John F. Kennedy, 43, assassinated Nov. 22, 1963, was the youngest person ever elected to the U.S. presidency. Emmanuel Macron, who is 39 years old, is the latest to join the ranks of the world's youngest leaders. Among the leaders who were under 45 when they took office:
The late Libyan leader was 27 when he seized power in 1969. The dictator held on to power until he was ousted in 2011. He was captured and killed a few months later.