The President’s Cognitive Decline

Remember these numbers. You’ll be asked about them at the end of the test: 70, 73, 76, and 78.
These are the ages of the leading candidates in the 2020 presidential election: Elizabeth Warren, Donald Trump, Joe Biden, and Bernie Sanders, respectively. In most any other line of work, people in their eighth decade are usually retired. For most of human history—and still in most of the world today—people of this age were usually dead.
Last month, Jimmy Carter, the 95-year-old former U.S. president, said that the office requires a person “to be very flexible with [one’s] mind,” and that by age 80 he wouldn’t have felt able to do the job. He joined the growing ranks of those suggesting they would support an upper age limit for the office, either for purposes of breaking up the gerontocracy or to ensure a person has the physical and cognitive capacity. “You have to be able to go from one subject to another and concentrate on each one adequately and then put them together in a comprehensive way,” Carter said.
The relevance to the current political moment was significant. Many neurologists and psychiatrists have raised urgent concerns about Donald Trump’s inability to hold a basic train of thought. Compared with his public appearances in decades prior, his meandering speech suggests declines in ability to reason and form basic arguments. A decade ago, he was capable of uttering sentences as cogent as Carter’s.