"...for some people, hot flashes can continue into their 80s..."

That rings true for me. I started menopause at age 49 and got through without much trouble. For instance, I'd have warm flushes but not hot flashes, as a friend of mine did. She would sometimes be literally dripping wet with sweat.

However, I am now 78 and now and again I still get a warm flush. Not much of a nuisance and it doesn't really impact my lifestyle, but it is a little embarrassing- I am sometimes afraid that the people present will think that I am pretending that I'm going through the change - at my age! lol