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.
After Kennedy graduated from Harvard in 1912 with a bachelor's degree in economics, he took his first job as a state-employed bank examiner; this allowed him to learn a great deal about the banking industry. In 1913, the Columbia Trust Bank, in which his father held a significant share, was under threat of takeover. Kennedy borrowed $45,000 ($ today) from family and friends and bought back control. At age 25, he was rewarded by being elected the bank's president. Kennedy told the press he was "the youngest" bank president in America.