No one. Theodore Roosevelt became US President on 14 September 1901 at age 42
Millard Fillmore
The age he was when he became a president is 48
52
47.
52
The Iran-contra scandal
42 He was the youngest person to assume the presidency. He became President after the assassination of President McKinley. John Kennedy became the youngest elected President.
56
62
Coolidge was 51 when he first became President.
Increasing defense spending