From a New York Times opinion piece by Katherine Miller headlined “Joe Biden’s Greatest Strength Is Also His Greatest Vulnerability”:

In February 2020, just before the world shut down, I was waiting for Joe Biden to speak on a Friday night in Henderson, Nev. The next morning I watched Bernie Sanders rally a fairly young, largely Latino crowd in a packed Las Vegas high school cafeteria. The Biden event, held when it looked as if he would not win the nomination, was smaller and more subdued. On the other side of a rope separating media from attendees, a group of Biden supporters were talking about how stressful it would be to be president at their and Mr. Biden’s age. As I remember it, one of them said, “But he feels he has to do it.”