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.
Thomas Jefferson Randolph
Thomas Jefferson Randolph (September 12, 1792 – October 8, 1875) of Albemarle County was a planter and politician who served in the Virginia House of Delegates, was rector of the University of Virginia, and was a colonel in the Confederate Army during the American Civil War. He was notable as the oldest grandson of President Thomas Jefferson. He helped manage Monticello near the end of his grandfather's life and was executor of his estate.