That old adage that you can stave off memory loss and general degeneration of cognitive ability by keeping your mind active always seems strikingly obvious to m

That old adage that you can stave off memory loss and general degeneration of cognitive ability by keeping your mind active always seems strikingly obvious to me, and I think it's pretty much true for people at any age. And anyway, what the heck are you doing if you're not keeping your mind active anyway? Watching paint dry? ;-)