Trump also took the MoCA test in 2018, after which the president’s doctor said he got 100 per cent, calling the president “very sharp.”

Nasreddine said it makes sense that Trump was recently advised to take the test again, given his age.

“We know that, after 70, that cognitive disorders become more and more prevalent, so I think because the candidates are in their 70s, including Biden and Mr. Trump, it is pertinent to do the test because one in four people – 25 per cent – will usually have cognitive impairment or dementia,” Nasreddine said.