I can't imagine anyone handling the stress, all the travel, meeting with all kinds of people, including other world leaders, dealing with crazy unjustified criticism, and ageism, as well as Biden does. No president is perfect. No president pleases everyone. In fact, nobody is happy with everything any president does or accomplishes, but all things considered, Biden has does an outstanding job and he has more experience than anyone else who might have run. Nobody even bothered to challenge him in the Democratic Party, so like it or not, he's the candidate and he's far better than the alternative, a psychopathic narcissist, who does have very obvious signs of cognitive decline compared to Biden, who simply mixes up names at times or misuses language, which is a problem he's dealt with since childhood. Shit! He even rides a bicycle while Trump is always in a gulf cart, and people are worried about Biden's health! People die at all ages, so a rather healthy 81 year old man who doesn't suffer from obesity and has an active lifestyle has a better chance of making it for four more years compared to a lot of middle aged folks I know personally.
There is so much disinformation and idiots who expect perfection from a president, and due to the insane electoral college along with the cult of the Orange menage, we may go down quickly if people don't support Biden. Plus, his VP has plenty of experience and if necessary she could step into the position and finish the term. People in the US are kooky. If they don't like some aspects of a candidate's personality, or some of their policies, they reject that candidate. Just vote blue, even if you're not happy with the choices. The alternatives are a nightmare.
I'm glad to see that a few conservative Republicans, like Liz Cheney are supporting Biden, despite not agreeing with a lot of his policies. Liz has praised the Democrats she worked with on the committee that investigated one of the Trump crimes. I don't agree with her policies, but I've read her book and I value her integrity. I wish all Democrats, independents and decent Republicans would be more like her instead of whining and trying to find little faults with the better candidate, who has helped save our country from authoritarianism. Enough said!