There will be so much Trump fatigue by the next election, it will drive people to vote. People are getting tired of Trump now including many Rebublicans who just may not vote for the Presidency, which will be good. I also believe the young people will vote because they don't like these abortion laws and the Republicans refusal to admit global warming exsists and is a real problem.

If there was a truly viable candidate . . .
and there just isn't. That said I didn't think Biden was going to be much of a president but his record has been extremely impressive, even given what he had to start with. Biden is certainly flawed but every person but one voted to invade a sovereign on a lie cooked up by Cheney, can't really fault him for that.
The age thing is an issue and applies equally to trump. The difference is when you hear each one speak and the words they form - hahahahaha no comparison, imho, trump's horrible.
Yeah, none of our president's have been perfect. But to make democracy work we need viable parties to participate and right now there is only one interested in a democratic republic.

The mere fact that this question gets asked about Biden, but not Trump, introduces prejudice into the question.

Where are Bernie’s supporters?

I’m a progressive, but Bernie has never backed progressives for Congress so IMO he’s useless.

I think that the whole idea that he would step down is seriously flawed. He is not going to do it, and that is that. Also, whether or not a democrat or republican gets elected, we still end up with a war criminal either way. Voting for either party is giving a blank check to the war hawks, and people who do it are just as responsible for the carnage that follows as the war criminals themselves. Call me radical if you like, but I am proud to say, I will not vote for either of these lying bastards.