...always been a nasty piece of work...
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Words and actions that are habitual become entrained when cognition declines and the filters no longer function.
If you used expletives a lot, you will be left with them. If you immediately responded with a cocked fist and anger, that will remain. If you had violent or profane thoughts that you suppressed, but did not try to counter, they will emerge in force. If you made no attempt to recall the forgotten names/faces/nouns, you will lose them. If you depend on filler phrases, they will remain.
This is true in normal aging, as well. It is wise to do all one can to mediate thought and word and deed while one is still mentally in charge.
When I blank on a name/face/place, I go through the *sounds like* words that come to mind and mull it over, attempting to find roundabout paths to the correct word. This helps a lot. Like a consistent misspelling, I try to be aware of the weak noun and if I have to look it up over and over, that just helps etch it into my mind. The negative habits, I really try to avoid, in thought and deed.
Decades ago, I learned to eliminate *um* & *ahh* from speech. I made myself stay silent if I didn’t have the exact word or to reword the thought on the fly if I drew a blank. This annoys some listeners, because you appear to be a know-it-all pedant, but it trains you not to grope around and flail in public speaking.
When I write, I use spell check. I sometimes have to use a search engine because spell check engines have limited vocabulary and I also proof read. Even then, typos appear, but making oneself cognizant of presentation helps keep your mind sharp as much as possible.
We all age and what is a gross failing with dementia is at least a minor failing of normal aging. Biden evidently never had much self-awareness to begin with, so his losses are that much more apparent while his habits of thought become more pronounced.
When I go blank on a name I start going through the alphabet. Usually helps.