Maybe if enough people voted for an opponent, it might get the point across that people want more choices in the future. What would my vote for Biden accomplishe since he's going to win anyway?
The argument that he's old is a legitimate one. If you look at Biden 10 years ago and Biden today, there is a huge difference. Everybody is different. Give him another five years and it will get worse. Elizabeth Warren is old too, but isn't showing it as much. Trump IS too old and, given his unhealthy life style, he is probably in more danger of a serious illness than Biden.