More than half of voters are worried about 's age and his fitness to serve in the , a new poll has revealed.A survey for PBS Newshour and NPR found that 62 percent of Americans believe the question of Biden's mental fitness is a real concern.The 80-year-old commander-in-chief, who will be 86 at the end of his presidency if he wins a second term, recently stumbled at a photo op at the summit in .
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