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.
Frank T. Johns
Johns was nominated for President of the United States by the Socialist Labor Party of America (SLP) in 1924. At the time of his selection, Johns was the youngest person ever to be nominated by a political party to run for President, just 255 days over the constitutional requirement of 35 years. Johns and running mate Verne L. Reynolds received 33,904 votes from 20 states in which they appeared on the ballot.