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 Story
In November 15, 1811, at the age of , Story became—and, as of 2018 remains—the youngest person nominated to serve on the U.S. Supreme Court. He was chosen by President James Madison to succeed William Cushing, who had died 14 months earlier. Madison's previous nominee for the seat, John Quincy Adams, was confirmed by the United States Senate, but had declined to serve. The Senate confirmed Story's nomination and Madison signed his commission on November 18, 1811. Story swore his oath and assumed office on February 3, 1812.