I don't recognise this phenomena of old people slaughtering others on the roads that you refer to.
If we really want to reduce road casulaties my top priorities would be:
Young drivers (17 -24)
Foreign HGV drivers
Motorcyclists
Having said that, I believe a driving licence in this country is...
For both those reasons, plus there is often an element of'showing off' to impress mates / girlfriends. More collisions seem to occur in the evenings when they are '4 up' than during the day whilst driving solo, going to work or college. And it is during the day when roads tend to be more busy...
In my experience, the overwhelming majority of fatal and / or serious injury RTCs involve young drivers (typically males under 25 but increasingly females too).
If we really want to reduce casulaties on our roads this is the demographic that needs to be targeted.