I think I've got two more 20+ year customers in their 80's with dementia onset. Irrational behaviour and the blank face response to explanations or questions. sigh. One just launched into a frenzy of landscaping including lion tailing a 60+ year old majestic spreading oak, against my advice, that I've babied all these years. I refused so they got the guy who lion tailed the neighbour's tree. Another key sign is factually incorrect memory of events.
Another 3rd guy, 10 years known, said his neighbour was in the hospital for 4 or 5 years - the it was actually 6 months.
You can't reason with these folks and whether communication even gets through is in question.
disheartening.