We just bought our boat from a gentleman in his 80s. Now, we was indeed selling because he was having trouble sailing her these days. But the really interesting part is that he bought the boat at 75. I was pretty impressed, and I hope at that age that I'm sailing too.
I agree that there are some people who do stupid things or attempt what's beyond their ability, but I think they come in all shapes, sizes, and ages.
1984 Sabre 34 Mk I