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.
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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.
Theodore Roosevelt
Theodore Roosevelt still holds the distinction of being the nation's youngest President. He was William McKinley's Vice President, and he was 42 years of age when he was sworn in as President following McKinley's assassination in 1901.
None. The youngest President was Theodore Roosevelt who took office when he was 42 years of age.
For the United States Presidential Campaigs the youngest presidential candidate eligible to take office if elected is of known record Brandon S. Dean. He registered his FEC Form 2 (Statement of Candidacy) in December of 2011. He was 34 years old. However, he will be 35 years old (the age necessary to be president) by November 6th, 2012. Source: www.showinguscitizenshowtorunforpresident.com