Whahappened. I understand the point you are making. It does depend how compos mentis he is though I suppose. I have a neighbour who is 83 and a professor of medicine. He still co-authors papers and writes reviews. He is articulate and sharp. He is also a complete pain in the arse. If I discovered he was stranded somewhere I'd leave him there and go for a beer.
The comment I took exception to was the one about 60 year olds. Probably by some whippersnapper :)