I know an older man living alone who keeps the house at 50 F. I could almost, deal with 60, but 50 is just too low. His sister wouldn't stay with him after he had surgery unless he put the house up to at least 65. He had to think long and hard about that.
He also only uses night lights except for maybe one reading light sometimes, even in the dead of winter. We worry that he may fall, and we worry that it so much looks like no one is home that someone may break in, be surprised by his presence and hurt him.
Once, years ago, we were having a staffing at the nursing home for his mother. Since Walgreen's was having a sale on soap and another store was having a sale on pizza, and both were on his way, he stopped and held up 3 family members and 2 professionals for 1/2 hour. Cost to the county? No idea. (I don't remember why he couldn't do those errands on the way home.)
He wears all of his clothing 3 days and only does the laundry once a month.
Worst, worst: he only flushes the toilet every couple of days. No one drops by to see him anymore, of course.