I'm friends with most of my neighbors, but it's done more on principle than a genuine concern about hypothermia. I would probably notice if something like the above were going on in my immediate area (maybe 3 houses in either direction on both sides of the street), but I don't really know for sure.
This is a good reason to have active friendships as long as you're alive. My grandmother, nearly an octogenarian, is still very active at church and with local friends. If anything happened to her, people would know almost immediately.
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