Now he is not talking coherently and is clearly losing it.
There are 3 things going on in this thread: Stuttering, aging, manipulated videos.
1. STUTTER - Biden's speech includes stutters and unclear articulation, and has for many years. Some videos show just those few minutes where Biden stumbles over words, ignoring what might be an hour of clear speech. Poking fun at someone's disability isn't the kind of humor I appreciate, but I realize others find it funny, and if that were the only thing going on, I wouldn't have said anything.
2. AGING - Biden is close to 80. As we get older, our speech tends to slow down and become less clearly articulated, in part because the muscles of speech - like all muscles - become weaker. His speech in his youthful senate speeches is stronger and more fluid than today. You'd probably hear something similar if you compare old vs young recordings of your favorite elderly grandparent, neighbor, or rav. These changes are normal, and not indicative of cognitive decline.
A couple of the videos seem to show
much slower and even unemotional speech, which raises two questions: Are other medical factors involved, such as a ministroke or a fall or side effects of medication or loss of sleep or beginnings of some disease like Parkinson's? And if so, are these deficits in speech only, as sometimes happens, or are there cognitive deficits as well?
I agree that there's reason for concern, but I'm certain that speech pathologists and neurologists would not spend years in training if these conditions could be diagnosed by watching a 30 second clip. I would welcome an analysis of his cognitive function by experts who actually examine him and analyze his speech throughout the day, but it's pointless to rely only on the videos presented here.
3. MANIPULATED VIDEOS. THIS is what bothers me. For the past 2 years, this thread has been filled with videos that have been deceptively edited in order to make Biden look stupid. If he is so naturally inept, why is it necessary to resort to manufactured gaffes? The answer is obvious - The perpetrators want to convince everyone that Biden is a bumbling idiot, so they bring false "evidence" that they know their audience will not bother to examine critically. Why do fall for it?