One thing on this is when a past-it driver has an accident due to decrepitute, even if (unlike this instance) little harm is actually done, it makes the national press and calls for "something to be done" ensue. 2000 are killed on the roads each year, overwhelmingly not by the elderly.
I can't help see a parallel with the calls for (anti-) cycling legislation in the light of the recent bad cycling case where the pedestrian was killed. Tragic though it was, it really is low priority compared to the carnage from motor vehicles. Likewise past-it drivers, 99% of whom self limit to familiar roads in daylight causing little more than mild annoyance by dithering.
Not saying it's OK, as this case shows, but in the greater scheme of things, moronic, aggressive, and downright murderous (ie with intent to use a vehicle to intimidate or wound) driving should be the focus of any policy.
If age is to be a criteria, wouldn't banning anyone under 25 or 30 save far more lives ?
The OP claims he's asking for a friend, and reckons he's a cyclist too 
