U.S. Presidents Ages When They Took Office
Theodore Roosevelt - 42 years, 322 days
John F. Kennedy - 43 years, 236 days
Bill Clinton - 46 years, 154 days
Ulysses S. Grant - 46 years, 311 days
Barack Obama - 47 years, 169 days
Grover Cleveland (1st term) - 47 years, 351 days
Franklin Pierce - 48 years, 101 days
James A. Garfield - 49 years, 105 days
James K. Polk - 49 years, 122 days
Millard Fillmore - 50 years, 183 days
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