I agree that his stutter is an important factor but for me it is less his getting the words right than the meandering. He was always prone to it but, at least to me, it seems worse and he used to be much sharper at responses. This article covers some of my worriesAre you basing this on his public statements during the campaign or something more involved? My mother-in-law, a former speech therapist, maintains that he seems like a septuagenarian with a chronic speech impediment (i.e., his stutter), which he is. That (along with the knowledge that she voted for Sanders in the MA primary) eased my concerns a fair bit about the potential cognitive decline behind Biden's mouthful of curiosities.
I'm more concerned about Trump and Sanders. The former's maintained bad habits over the long term and doesn't seem the sort to reform, and the latter had a heart attack a few months ago and is newly reluctant to disclose his medical records. I haven't heard about any chronic ailments with Biden beyond his tendency to trip over his mouth. But I'm unable to diagnose from a remote location so who knows.
Joe Biden Is Old
Thursday’s debate made it painfully clear that Biden is not the candidate he used to be.
I agree about Sanders and Trump‘s issues though - I basically just can’t get comfortable with the idea that our presidential choice comes down three septuagenarians but I guess I’m going to have to.