I have to walk to school (its not that far) every day at it seems I am always having a near death experience involving either a, a really old driver, or b, a young female driver. Thats just my observations. Going through red lights, stop signs, not paying attention at crosswalks, etc.
I believe at a certain age, you should have to under go a yearly road test or something. You have to be a certain age to drive, so as you get older, I feel you should have to test, to make sure your ability to safely drive hasn't diminished.
Age really has nothing to do with it. My dad was 59 when he died and I would not trust him behind the wheel from about age 55 on. My mom, on the other hand is 55 (or the same age as Patty Duke ) and I trust her driving completely. I have seen some 80 year olds that do very well and some 40 year olds that shouln't be allowed to drive.