You sound very childish. No one should be allowed to drive just because "they want to". Driving is an activity that makes you responsible for the lives and safety of those you are sharing the road with. If you are not capable of being completely safe, you should have your license revoked. If you are driving and your eyesight is bad or your reaction time is slow, then you are not safe. Unfortunately those are the types of things that come with old age, and in my opinion they do need to be retested to prove they will be safe on the road. It is no different than having to prove you can drive safely the first time you test.