Age at Inauguration

Donald Trump was the oldest president sworn-in at 78 years 220 days.
John F. Kennedy was the youngest elected president at 43 years 236 days.
After McKinley died, Theodore Roosevelt became the youngest president at 42 years 322 days.
William Henry Harrison became the oldest president at 68 years 23 days in 1841. He held that record for 140 years when, in 1981, Ronald Reagan was sworn in at 69 years 348 days.
On average presidents are sworn in at 55 years old.

Rank	#	President	Age at Inauguration
1	47	Donald J. Trump	78 years 220 days
2	46	Joe Biden	78 years 61 days
3	45	Donald J. Trump	70 years 220 days
4	40	Ronald Reagan	69 years 348 days
5	9	William Henry Harrison	68 years 23 days
6	15	James Buchanan	65 years 315 days
7	41	George H. W. Bush	64 years 222 days
8	12	Zachary Taylor	64 years 100 days
9	34	Dwight D. Eisenhower	62 years 98 days
10	7	Andrew Jackson	61 years 354 days
11	2	John Adams	61 years 125 days
12	38	Gerald R. Ford	61 years 26 days
13	33	Harry S. Truman	60 years 339 days
14	5	James Monroe	58 years 310 days
15	4	James Madison	57 years 353 days
16	3	Thomas Jefferson	57 years 325 days
17	6	John Quincy Adams	57 years 236 days
18	1	George Washington	57 years 68 days
19	17	Andrew Johnson	56 years 107 days
20	28	Woodrow Wilson	56 years 66 days
21	37	Richard M. Nixon	56 years 11 days
22	24	Grover Cleveland	55 years 351 days
23	23	Benjamin Harrison	55 years 196 days
24	29	Warren G. Harding	55 years 122 days
25	36	Lyndon B. Johnson	55 years 87 days
26	31	Herbert Hoover	54 years 206 days
27	43	George W. Bush	54 years 198 days
28	19	Rutherford B. Hayes	54 years 151 days
29	8	Martin Van Buren	54 years 89 days
30	25	William McKinley	54 years 34 days
31	39	Jimmy Carter	52 years 111 days
32	16	Abraham Lincoln	52 years 20 days
33	21	Chester A. Arthur	51 years 349 days
34	27	William H. Taft	51 years 170 days
35	32	Franklin D. Roosevelt	51 years 33 days
36	30	Calvin Coolidge	51 years 29 days
37	10	John Tyler	51 years 6 days
38	13	Millard Fillmore	50 years 183 days
39	11	James K. Polk	49 years 123 days
40	20	James A. Garfield	49 years 105 days
41	14	Franklin Pierce	48 years 101 days
42	22	Grover Cleveland	47 years 351 days
43	44	Barack Obama	47 years 169 days
44	18	Ulysses S. Grant	46 years 311 days
45	42	Bill Clinton	46 years 154 days
46	35	John F. Kennedy	43 years 236 days
47	26	Theodore Roosevelt	42 years 322 days

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