Stepping into office at the age of 42, this man remains the youngest to ever become President of the United States.

Assuming office at the age of 42 after McKinley was assassinated, Teddy R. remains the youngest U.S. president. The two-term 26th president, known for his "cowboy" persona, had a penchant for power, as he expanded presidential and federal powers while he was in office and established the U.S.'s role on the world stage. In fact, he won the 1906 Nobel Peace Prize for driving an end to the Russo-Japanese War. John F. Kennedy was the youngest person ever elected to the office, but Teddy took it younger due to circumstance.

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