“I have a cognitive test every day,” said Biden, who would be 86 when he leaves office if re-elected in November. Trump, 78, also faced questions about his cognition when he was in office.

Biden is resistant to taking a cognitive test. Try a short one yourself. This isn’t a real cognitive test, but it should give you an understanding of how simple screenings work.

Trump boasts about his vitality often and even said he "aced" two cognitive tests during the recent debate. The public, however, knows shockingly little about the former president's health.

Trump said he took a second cognitive test for his last physical exam at the end of 2023 and “aced it.” ... It’s not clear that Biden has ever had such a baseline examination for comparison.

The blood test’s accuracy was highest with patients who had already progressed to dementia and was slightly lower with patients in a pre-dementia stage called mild cognitive impairment, Dr ...