Every driver has the responsibility to be safe - for their own sake and for others, too. We all should take a re-test every few years to identify any bad habits, poor attitude etc. Just because a driver is human, this doesn't remove their responsibilities. Do you want your 75 year old airline pilot, or your 80 year old doctor to have had no assessment, check-up or re-test - ever??? I think no. Just because a driver is nice, polite, human shouldn't give automatic right to drive.