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.
List of vice presidents of the United States by age
The median age upon accession to the vice presidency is around 53 years and 7 months. This is about how old John Adams and Hubert Humphrey were at the time they entered office. The youngest person to assume office was John C. Breckinridge, at the age of . Serving only one term, he became and remains the youngest at the time of leaving office; the oldest at the time of entering office was Alben W. Barkley, at the age of . He was also the oldest in office when he left office.