Ronald Reagan was 77 when he left the White House, but President Joe Biden, who turns 80 on Nov. 20, would be 86 by the time a second four-year term ends, should he win it. About a quarter of Republicans, 26%, think Trump may not be up for 2024 because of his age. Political affiliation aside, 68% of people surveyed think Biden may not be up for the challenge two years from now, and 49% say the same about Trump. Some 86% of Americans said they believe the cutoff for serving as president should be age 75 or younger, the poll found. Some Biden supporters said they admired Democrats' success under Biden, but were still uncertain about a possible next term.

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