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.
John Henry MacCracken
John Henry MacCracken (September 30, 1875 – February 1, 1948) was an American academic administrator who served as president of Westminster College and Lafayette College. When he was chosen as president of Westminster College in 1899, MacCracken was the youngest college president in the United States. MacCracken was the son of Henry MacCracken, a chancellor of New York University, and the brother of Henry Noble MacCracken, a president of Vassar College.