May he have many years of safe driving, LR 
I hope so too. I think it is important to know when to give up driving when one is getting on in years. I have asked my children to tell me when they think I am no longer safe to be behind the wheel. Not that I need to ask, they will remove my keys if they have any concerns.
I was very surprised that the Duke of Edinburgh was permitted to drive on the public highway at his age and state of health. It was a miracle no one was killed or seriously injured when he crashed his vehicle. I am a monarchist but I am so glad the police breath tested him as they did the other driver, they were both clear. If the Duke is deemed to be responsible for the crash, he should be prosecuted, just like anyone else would be.