It has always amazed me that over 75s are assumed to be okay to driver a lethal weapon without any form of compulsory retest. Anyone requiring further evidence of the inadequacies of the present system for monitoring old drivers should read THIS STORY.
Whilst young drivers are supposedly more likely to have accidents (based on miles driven), older drivers are far more likely to have accidents based on journeys made. Far too many times in my life I have seen old drivers weaving along a road, doing 20mph in 50 mph zones or driving straight through traffic lights or pulling out at roundabouts without any awareness of other drivers. yes, other drivers do this, but the proportion of alder drivers who do this is much higher.
I am not suggesting all people over the age of 75 are not fit to drive, far from it, but there are many who are not.
How many people have to die before the government, any government will take serious action to ensure that over 75's are fit and competent drivers.