My great-grandmother just died this year at 100 years old. She was still driving after 90, and she was perfectly competent at it in the farm town where I grew up. Her daughter, on the other hand, is a horrible driver. I mean, shaky on the wheel, stabby on the pedals, and just looking everywhere but forward. I'd be amazed she hasn't been involved in some horrible wreck except for the fact that she rarely leaves the house. Being 80 will do that to you, I suppose.