JFK Library Foundation On January 20, 1961 John F. Kennedy took the oath of office to become the 35th president of the United States. He was the youngest man elected president, as well as the 1st Catholic and the 1st to be born in the 20th century. In his inaugural address, he spoke to not only the American people, but also people throughout the world—including newly independent nations, old allies, and the Soviet Union. The “Ask not” call to public service may be the most famous from his addres