If it's a question of age alone, then absolutely not. I personally know a 96-year-old man who still dusts crops for a living, and a 98-year-old woman who still trains horses during the spring and enjoys snowshoeing in the winter. My own husband was raised by a man who, at 106, still had 20/20 vision and a mind as sharp as it had ever been. If your eyesight or your wits are slipping beyond management or correction, no matter your age, then you should give up driving. There's no reason to give it up just because you reach a certain amount of time you've been on Earth.