My son is 21, on his way to 4yrs ncb, I've seen him driving when he hasn't known, followed him, and been in the car with him and I've no complaints.
My wifes grandfather who at around the age of 81, crashed into a kerb at the side of the road hard enough to buckle the wheel, damage the tyre and bend the suspension. Didn't think much of it at the time until I was shown where he did it. It was on the inside lane of a two lane slip road near where he lives, he should have been on the outside lane for where he needed to go anyway, and I could see no reason for why he should have hit the kerb beside the car and he couldn't give an explanation for it neither.
I've noticed an increasing number of older people driving through residential roads, when the have to overtake parked cars, completely ignore oncoming traffic who have right of way and also drive completely on the wrong side of the road straight at the oncoming cars.