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.
Marvin Bush
Marvin Pierce Bush (born October 22, 1956) is an American businessman. Bush is the youngest son of former U.S. President George H. W. Bush and First Lady Barbara Bush and the brother of former U.S. President George W. Bush; former Florida Governor Jeb Bush; Pauline Robinson "Robin" Bush, who died of leukemia at the age of three; Neil Bush; and Dorothy Bush Koch.