10. John Tyler
51 years and 8 days
9. Millard Fillmore
50 years and 184 days
8. James K. Polk
49 years and 122 days
7. James A. Garfield
49 years and 105 days
6. Franklin Pierce
48 years and 101 days
5. Grover Cleveland
47 years and 351 days
4. Ulysses S. Grant
46 years and 311 days
3. Bill Clinton
46 year and 149 days
2. John F. Kennedy
43 years and 236 days
1. Theodore Roosevelt
42 years and 322 days
According to Whitehouse.gov
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