I have one of those. An aunt and uncle who live fairly modestly compared to how they could given a mid seven-figure portfolio... they are in their late 80s and still snowblow their driveway in the winter and mow their own lawn in the summer when they could well afford to hire it out. Dear Uncle slipped off the mower a few years ago and his hand got caught in the blade almose severing his thumb and damaging his four fingers. He had to be airlifted to a major medical center for surgery. Luckily, he had a full recovery but still insists on mowing his own lawn. I'm trying to convince him to relocate from their long-time home to a very nice CCRC when they would not have to worry about meals, would have other people their age nearby for fellowship, assistance from the staff for my aunt with her dementia, etc. to no avail.
Everytime I am at their home they have classical NPR playing. I have tried to convince him to do a QCD from his IRA and be the anonymous listener behind an offer to match any donations for a period fo time, but also to no avail (to my knowledge).
In short, I have been doing as much as I can encouraging him to spend more to improve his and my aunt's quality of life in their remaining years and also give some away while they can enjoy seeing the benefit of their contributions, but no-go.
Meanwhile a bunch of charities will get a lot of money once they pass.