Updated September 1, 2025 |
Infoplease Staff
Curious who reached the Oval Office at the youngest ages? The table below ranks U.S. presidents by their age on the day they assumed office, showing years and days for a clear comparison as of 2025.
Youngest U.S. Presidents (By age upon taking office)
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Note (updated as of 2025): Theodore Roosevelt was sworn in after the assassination of William McKinley in 1901, making John F. Kennedy the youngest president elected to the office. At 78 years and 61 days, Joe Biden is the oldest president at inauguration (Jan. 20, 2021). Donald J. Trump was 70 years and 220 days old at his 2017 inauguration.
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See Also:
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People also ask
Who is the youngest U.S. president?
Theodore Roosevelt became president at 42 years and 322 days old in 1901 after the assassination of William McKinley.
Who is the youngest living former U.S. president?
Barack Obama, born in 1961, is currently the youngest living former president. He left office in January 2017 at the age of 55.
Who is the oldest U.S. president at inauguration?
Joe Biden is the oldest, sworn in at 78 years and 61 days on January 20, 2021.
Has any president taken office before age 40?
No. Theodore Roosevelt is the youngest at 42; no U.S. president has assumed office before the age of 40.
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