Its a free country nothing should be compulsory
However I agree ALL drivers should be retested every few years on their ability to drive safely, (cat among pigeons here I think) not just on their ability to see.
How many times have you seen people look when crossing the road and still walk out infront of a vehicle or look wat you approaching a junction and still pull out. People can look without seeing.
Not sure where you get the over 50s from as only mention two people in there 80s