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Who was the youngest president of the United States?

By Martin Kelly, About.com

Question: Who was the youngest president of the United States?
Answer: While many mistakenly say that John F. Kennedy was the youngest president of the United States, this is in error. He was the youngest president ever elected to the presidency at the age of 43. However, Theodore Roosevelt was the youngest man to serve as president when he took over after William McKinley's assassination. He was 42.

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