That wouldnt have anything to do with the fact that most drivers are young hetrosexual males? FYI. Grandparents are 3 times more likely to have a car accident than their grandchildren.
Trying to guess the appearance of a driver from their driving is a good travel game. Sometimes I think about someone's driving that "That's either a woman or an old man" (That does sound a tiny bit intolerant doesn't it?) Usually it's when I'm stuck behind them at a road junction. But when I see a car approaching me at speed on my side of the road, I always think "That's either a young male or an escaped lunatic"