> How about the general decline of cognitive ability with age? This is a real issue at say 85, not at 45. You almost certainly aren't quite as quick as you w

> How about the general decline of cognitive ability with age? This is a real issue at say 85, not at 45. You almost certainly aren't quite as quick as you were when you were 25, but on the other hand you typically know a lot more and the experience probably means you actually make far fewer errors overall...