Mandatory full retest for anybody who loses their licence, and jail time for driving whilst disqualified.
In my view, those most likely to cause / have an accident are those motorcyclists who fail to understand that the rules of the road, ( speed limits, solid white lines in the centre of blind bends, not overtaking in the face on oncoming traffic, etc ), apply to them as much as to car drivers. I wouldn't have thought many of them are over 60.