There are also concerns about 78-year-old Republican nominee Donald Trump's fitness for office — registered voters are split on whether he still has the cognitive skills for this job. "I have a cognitive test every single day," he added, alluding to the requirements of his job. Trump continues to boast that he "aced" the basic cognitive tests he took over four years ago, when he was president. These cognitive tests only rule out disease. Doctors themselves have resisted mandatory cognitive tests for older physicians — in part because it's ageist, but also because memory tests don't tell you whether someone is good at their job.

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Persons: —, Biden, Donald Trump's, neuropsychologist Joel Kramer, might've, Trump, Kramer, Dusan Stankovic, he's, There's, Biden's, George Stephanopoulos, Sanjay Gupta, Stephanopoulos, it's Organizations: Service, Republican, Business, University of California, SAGE, The Ohio State University, telltale, FDA, White Locations: San Francisco, Montreal