Not sure if that was a slip.
Say what you dislike about Biden, but he is still very much on the ball and sharp minded and energetic versus geriatric...
Both Biden & Donald are old. They're only a few years apart. Biden is still physically & mentally fit. Not sure why you'd think otherwise, unless you want to say that him grieving his son's death makes him mentally unfit. It makes him a human, that's all.
Now sure Biden has slipped up. Made gaffes. They're rare enough that anytime he does that, Donald's base seizes upon it, makes a whole dang thread here all about it. Lol. Just imagine how many threads would be required to cover the chronic misstatements made by Donald Trump. Not to mention his habitual dishonesty. At this point it's not a flame to say that, on account of how it's proven fact. Donald manages to lose his point in under a minute. He says outlandish things that are totally false. He pushes the craziest conspiracy theories. He shows emotional weakness by lashing out in a total disproportionate way to any kind of criticism or rivalry. Donald recently tried to snidely call out a mistake Biden had made. In the process of doing that, Donald got it all wrong himself. Made a mistake himself, about a mistake. Smh & lol. Folks right here on this forum have made all sorts of errors all the dang time. Myself included. I'm far from being old. Presidential candidates decades younger than than those 2 have misspoken. Considering how often candidates speak, it's hardly a surprise.