Also what level of impairment are we talking about here? You make it sound like everyone over a certain age is a doddering old coot. :)
http://news.mit.edu/2015/brain-peaks-at-different-ages-0306
I also didn't mean to sound like that :) I'm on the "decline" side and even though I'm not necessarily happy with that, I also understand that you can't cheat biology.
Also what level of impairment are we talking about here? You make it sound like everyone over a certain age is a doddering old coot. :)