The Top Ten: Youngest U.S. Presidents

Youngest U.S. Presidents (By age upon taking office)

Rank	President	Years	Days
1.	Theodore Roosevelt	42	322
2.	John F. Kennedy	43	236
3.	Bill Clinton	46	154
4.	Ulysses S. Grant	46	236
5.	Barack Obama	47	169
6.	Grover Cleveland	47	351
7.	Franklin Pierce	48	101
8.	James Garfield	49	105
9.	James K. Polk	49	122
10.	Millard Fillmore	50	184

Note: Roosevelt was sworn in after the assassination of William McKinley in 1901, making Kennedy the youngest president actually voted to the office. At 70, Donald J. Trump was the oldest president to take office.