What about the fact, that the older old drivers,ie 70+, drove in a time where their were far fewer cars on the road to have to consider, and life did move at a slower pace, also the roads, signs and cars were far less geared towards speed as an essential requirement. I think the first speeding ticket issued was to a motor vehicle doing 4mph... by old bill on his pushbike!!!
If this is true with the olds, then the opposite could be true with our 'yoof'. The whole world is in a rush now days, everything is done at pace, so the theme carries on to driving too.