U.S. President Joe Biden disembarks from Marine One at Delaware Air National Guard Base en route to Wilmington, in New Castle, Delaware, U.S., November 17, 2023.
"I know I'm 198 years old," Biden joked back in June.
If re-elected, Biden would be 86 by the end of his second term in office.
Republican Ronald Reagan, who had the prior record as oldest U.S. president, ended his second four-year term at age 77 in 1989.
Seventy-seven percent of respondents, including 65% of Democrats, said Biden is too old to be president, while just 39% said Biden was mentally sharp enough for the presidency.
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Marine, Wilmington, New Castle , Delaware, U.S