57 325 | The four presidents who took office at age 57, and Thomas Jefferson, who did it 325-days after his birthday

http://www.robinsonlibrary.com/america/unitedstates/presidents/byage.htm

4 of the first 6 presidents were 57-years-old when inaugurated.

George Washington, the first.

Thomas Jefferson, the third.

James Madison, the fourth.

John Quincy Adams, the sixth.

Birthdays and Inauguration Days:

George Washington took office 68-days (69) after his 57th birthday.

Thomas Jefferson took office 325-days (326) after turning 57-years-old.

James Madison took office 353-days (353) after his 57th birthday. (353, the 71st prime)

John Quincy Adams took office 236-days (237) after his 57th birthday. (33-weeks and days)