record_voice_over 45 records, sorted by:
- With the assassination of 25th President william McKinley, Theodore Roosevelt at age 42 became the 26th and youngest President.
- The youngest to become president by election was John F. Kennedy, who was 43 years old.
- The oldest was Joe Biden who assumed the presidency at the age of 78.
- The second oldest was Donald Trump who assumed the presidency at the age of 70.
- 56.0 is the average age of the Presidents upon inauguration.
- Click bar chart
Age At Startbelow for details.
List of Presidents by Age at Inauguration