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
On three occasions the oldest living vice president lost this distinction, not by his own death, but by the inauguration of a vice president who was older. John C. Calhoun (born 1782) lost this distinction when Richard M. Johnson (born 1780) was inaugurated. Charles G. Dawes (born 1865) lost it when Charles Curtis (born 1860) was inaugurated. Dawes subsequently regained the honor, as he outlived the older Curtis. More recently, Hubert Humphrey (born 1911) ceased being the oldest living when Nelson Rockefeller (born 1908) was sworn into office.