The youngest president in U.S. history is Theodore Roosevelt, who took office in 1901 at age 42. Here's the full list, from youngest to oldest.

How Past Presidents Spent Their Time After Leaving the White House. ... 2025, he became the 47th president of the United States and only the second president to hold two non-consecutive terms ...

Topping the list of most forgotten presidents is Rutherford B. Hayes, who was born in Delaware, Ohio and elected as the 19th president, serving one term from 1877 to 1881.