Doctors have put forward a fascinating theory about why it is former President , rather than the incumbent , who is at the greatest risk of cognitive decline and dementia.Biden, 81, has suffered a series of public gaffes, falls and memory blanks that now mean a large majority of to run for office. Trump, 77, is also no stranger to high-profile verbal slip-ups, which his supporters say are a result of the off-the-cuff public speaking style he's become famous for.
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