John F. Kennedy was the second youngest president ever at 43. He was the youngest to be elected but the youngest president ever was Theodore Roosevelt who assumed office after the assassination of William McKinley.
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The third youngest President of the United States was Bill Clinton, who was 46 years, five months and 1 day old when he took office. That made him about five months younger than Ulysses S. Grant and a year younger than Barack Obama.
As of the inauguration of forty-fourth President Barack Obama, the sixth youngest President at the time of the start of his Presidency is Grover Cleveland, who started his first tenure as President at the age of 47 years 351 days.
The third youngest President of the United States was Bill Clinton, who was 46 years.
The youngest president was John (Jack) F. Kenedy his inauguration day he was 43 years old.
The youngest President was Theodore Roosevelt, who entered office at the age of 42. He is followed by John F. Kennedy at 43, and Bill Clinton at 46 as the youngest presidents ever to take office.Theodore Roosevelt was 42 when he became president after the death of McKinley.
Thirty eight
Kennedy was the youngest person to be elected president. He was also the youngest president to die when he was killed.
Theodore Roosevelt
The youngest man to be president of the United States was Theodore Roosevelt, who took office at the age of 42, following president McKinley's assassination. The youngest man to be elected into the position was John F. Kennedy, at 43.