Age of U.S. presidents when assuming office. Article Two of the United States Constitution provides that U.S. presidents must be at least 35 years old at the time of taking office. The median age at inauguration of incoming U.S. presidents is 55 years. [1] [2] The youngest person to become U.S. president was Theodore Roosevelt, who, at age 42, succeeded to the office after the assassination of ... More @Wikipedia
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