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I'm "only" 72 but have found the heat over the last couple of summers quite unbearable.
I bought a portable air conditioner two years ago and have just bought another ex-display, a bargain! They do bring the temperature down to bearable levels though I know it is an expensive way to deal with the problem.
I do most of my shopping online and if it is really hot I only go outside to take my grandchildren to school.
I keep my blinds down when the sun is on those windows and keep the awning down over my living room doors.
We've air con, makes the house bearable during the summer. I'm aware of cost, which is not large, however I'm thrifty other ways.