I think it's when you reach 70 you have to take another test - i think it's mainly eyesight and health etc. I agree that when they get older, people should have more tests to ensure they are not going to conk out at the wheel.
In my book driving offences are not punished hard enough. Two years ago, a local driver caused a terrible accident. He was speeding on the wrong side of the road and hit an oncoming car, killing the two occupants. He was drunk - 3 times over the legal drink drive limit and was already banned for previous drink driving offences. In fact it was his FOURTH serious drink driving offence. He was jailed for five years but appealed and got his sentence reduced. He killed two people!
I think they should have chopped his legs off. That would stop him getting back into a car.