What was the closest a U.S. President was elected to his birthday?

The 29th President, Warren G. Harding, was elected exactly on his 55th birthday -- November 2, 1920.

https://en.wikipedia.org/wiki/1920_United_States_presidential_election

This is from google AI search:

The closest a U.S. President has ever been elected to his birthday is 0 days, a distinction held solely by Warren G. Harding, who was born on November 2, 1865, and won the 1920 United States presidential election on his 55th birthday on November 2, 1920. The two next closest presidents are James K. Polk, who shared Harding's November 2 birth date and secured his election just 3 days later on November 5, 1844, and James A. Garfield, who was born on November 19, 1831, and won the presidency on November 2, 1880, a mere 17 days before his 49th birthday.

References

https://en.wikipedia.org/wiki/1920_United_States_presidential_election

https://en.wikipedia.org/wiki/1844_United_States_presidential_election

https://en.wikipedia.org/wiki/1852_United_States_presidential_election

The closest a U.S. President has ever been elected to his birthday is exactly on his birthday. Warren G. Harding is the only U.S. president to achieve this feat. He was born on November 2, 1865, and won the presidential election on November 2, 1920, his 55th birthday. Coincidentally, his Democratic opponent in that election, James M. Cox, was also from Ohio. The election day was historic for two other reasons: it was the first presidential election in which women nationwide had the right to vote, and it was the first time election returns were broadcast over the radio.

Is the question asking who was elected closest to the calendar DAY and DATE of birth, or who was elected closest to their actual BIRTHDAY? In the latter case, it'd have to be John F Kennedy. Although Theodore Roosevelt qualifies as the youngest non-elected president. https://www.guinnessworldrecords.com/world-records/77697-youngest-elected-as-us-president