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.
Joseph P. Kennedy Sr.
Joseph Patrick Kennedy (September 6, 1888 – November 18, 1969) was an American businessman, investor, and politician known for his high-profile positions in United States politics. Kennedy was married to Rose Kennedy, and three of their nine children attained distinguished political positions: President John F. Kennedy (1917–1963), Attorney General and Senator Robert F. Kennedy (1925–1968), and longtime Senator Edward M. "Ted" Kennedy (1932–2009). John won the 1960 presidential election; Robert was assassinated during his presidential primary campaign in 1968; Ted was defeated in the 1980 Democratic Party primary by incumbent President Jimmy Carter. His eldest son Joseph Jr. was killed in action during World War II, age 29, in 1944. He was a leading member of the Democratic Party and of the Irish Catholic community. President Franklin D. Roosevelt appointed Kennedy to be the first chairman of the U.S. Securities and Exchange Commission (SEC), and he later directed the Maritime Commission. Kennedy served as the United States Ambassador to the United Kingdom from 1938 until late 1940, when he annoyed Roosevelt by his pessimism about Britain's survival.