Both of the candidates in this race are aged to the point where mental decline is evident. Assuming he wins and survives to the end of a second term, Biden will be 86 when leaving office. Trump would not be far behind, as he is only 4 years younger.
I'm not going to claim that old people cannot meaningfully contribute to society, but I do think that we need to end this gerontocracy if we want to have any hope of reversing our obvious decline as a nation. It is not right that old men and women (Pelosi was 82 last year when she finally retired, thank the good Lord) maintain power past the period which they are able to understand the country and world in which they are making major decisions. Doing so results in government which is not as responsive or capable as it could be. For example, congress is currently (for at least the second time) debating legislation which would ban the app Tiktok from being downloaded or used in the United States, out of fear of its connection to a Chinese parent company and what that could mean for the safety of user data and, similarly, U.S. security interests. I'm not going to comment on the the app itself (as I do not have it on any device I own), but it strikes me as hopelessly outdated to focus excessively on the security concerns related to this one app because of its "Chinese connection" when so many similar apps owned by big U.S. tech companies such as Meta/Facebook/Instagram have proven to be so vulnerable on this front. Remember the Cambridge Analytica debacle with Facebook? I'm going to guess most of our representatives in congress do not, or if they do, such situations are stuck on the backburner because "Oh no, CHINA!" Well, China may be a problem (in fact, I highly agree that they are in the area of technological espionage and the like), but again, this is clearly a remanent of the "Cold War" mentality that much of our government still holds because the people running it largely grew up in the 1950s and 1960s when fears of a war with the Communist world were very reasonable to have. They're less reasonable today, at least on the grounds that the states involved are communist (read: It is still reasonable to have concerns about China; it is less reasonable to have concerns about China because China is "communist"). Yet that's what we're stuck with because of the mentality of the 65+ set who rule us. Younger people could make (and have made) the point that the USA should deal with Tiktok via more wide-reaching legislation that brings all social media apps (not just those owned by non-U.S. companies) up to the data privacy standards of other first world nations, such as the protections provided to social media users in much of Europe. Of course, that's not going to happen, because making it harder for scummy businesses to treat their customers like sheep to fleeced is another thing that brings out shrieks of "COMMUNIST!" from a not-insignificant chunk of the elder set, for the reasons already given above.
So yes, Trump is getting worse, Biden is probably also getting worse (didn't watch his address yesterday, so I can't comment on that), but more to the point, the whole dang system is getting worse, because it all suffers from this problem. Too many old/inflexible/unresponsive/practically comatose people in power is never good for anyone.