If you elect Biden with high probability we end up with i.) he dies on the job, ii.) he steps down during his term or iii.) he is removed by his cabinet. Just completely ridiculous to nominate anyone over 75, let alone 81. Mandatory retirement exists for a reason.
Here I think lies the main problem. When Biden was elected in 2020, in my understanding the goal was always for him to warm the seat for the next/younger generation. In those 4 years nobody stepped forward, and they are scared of proposing a forward looking vision because it may alienate some voters (either on the left or in the center). So now we have the choice between stagnation or actively tearing down Democracy.