The question now is whether Biden can establish 80 as an acceptable age for presidents. It’s not going well. Many observers were concerned recently by the president’s “Where’s Jackie?” moment, when at a Sept. 28 White House event he called out to recognize Rep. Jackie Walorski (R-IN), who was killed in a car crash on Aug. 3. Biden, who had issued a statement when Walorski died, seemed completely unaware that she was gone. Later, in response to repeated press questioning, White House press secretary Karine Jean-Pierre refused to admit Biden made a mistake, saying instead that Biden had Walorski “top of mind” during the event.

It was a disconcerting episode that probably would have been dismissed had it not come after reams of evidence, many, many examples, that suggest Biden has memory and cognitive problems. After the “Where’s Jackie?” episode, RealClearInvestigations writer Mark Hemingway tweeted a video of then-Sen. Biden speaking in a rapid, sharp, and focused way in 1997 and asked, “Watch this clip from 25 years ago and tell me he’s not suffering from dramatic age-related mental decline.” …

Still, Biden might insist on trying for a second term, especially if it becomes clear that Trump, who will turn 78 in 2024, decides to run again. A second term would mean Trump would serve to age 82, meaning that a Biden-Trump matchup in 2024 would be a campaign in which both candidates are too old to be president.