Will Joe Biden last the course?

The US newspapers are having a field day speculating about whether Joe Biden will stay the course and fight Trump for the presidency or step down and let a younger candidate try and stop the former president from returning to the White House. But we are only a few months away from nomination day for the Democratic party. Is it really possible or practical for Biden to decide at the last moment not to stand and let someone younger take over? I know US politics are crazy but I can't see Biden doing any such thing. So, even though a large number of American voters don't like the idea of a 2020 rerun with two old men in the race for the White House, that seems most likely to be the scenario facing the electorate later this year. Trump can't escape the "old" tag because recently he has made a few verbal slip-ups which have given his critics ammunition to cast doubt on his mental faculties. Like when he muddled up Nancy Pelosi with Nikki Haley. Several times. All the speculation is that Trump is going to choose a woman to be hs running-mate, so he'll have to make sure he gets her name right! Biden won't have this problem because he said right from the start that Kamala Harris would be his running-mate, and he sees her every day in the White House, so he sould be able to remember her name. Between now and November, watching out for slip-ups by both Biden and Trump is going to be the hottest game in town. He who makes the smallest number of gaffes will probably win the election.