IMO.
Everyone over 60 should require re-testing
Everyone over 70 should require re-testing every 5 years.
Everyone over 80 should require re-testing every 2 years.
Everyone over 90 should require re-testing every year.
If you're still sharp and can drive to a sufficient standard to pass a driving test, I don't have a problem with a 100 year old on the road. But if you're no longer capable - you need removing before you cause an accident. This is probably long before you'd choose yourself to give up driving.
Everyone over 60 should require re-testing
Everyone over 70 should require re-testing every 5 years.
Everyone over 80 should require re-testing every 2 years.
Everyone over 90 should require re-testing every year.
If you're still sharp and can drive to a sufficient standard to pass a driving test, I don't have a problem with a 100 year old on the road. But if you're no longer capable - you need removing before you cause an accident. This is probably long before you'd choose yourself to give up driving.