Top 10 Youngest US-Presidents 

Barack Obama – 47 years, 169 days at Start of presidency: Barack Obama (born August 4, 1961).

James A. Garfield – 49 years, 105 days at Start of presidency: James A. Garfield (November 19, 1831 – September 19, 1881).

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Grover Cleveland – 47 years, 351 days at Start of presidency: S. Grover Cleveland (March 18, 1837 – June 24, 1908).

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Franklin Pierce – 48 years, 101 days at Start of presidency: Franklin Pierce (November 23, 1804 – October 8, 1869) .

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Millard Fillmore – 50 years, 183 days at Start of presidency: Millard Fillmore (January 7, 1800 – March 8, 1874).

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Bill Clinton – 46 years, 154 days at Start of presidency: William “Bill” Clinton (born  August 19, 1946).

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James K. Polk – 49 years, 122 days at Start of presidency: James K. Polk (November 2, 1795 – June 15, 1849).

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Ulysses S. Grant – 46 years, 311 days at Start of presidency: Ulysses S. Grant (April 27, 1822 – July 23, 1885).

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John F. Kennedy – 43 years, 236 days at Start of presidency: John F. Kennedy (May 29, 1917 – November 22, 1963).

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Theodore Roosevelt – 42 years, 322 days at Start of presidency: heodore Roosevelt Jr. (October 27, 1858 – January 6, 1919).

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