Well let's see now. I am 76 years young, never had an accident, have a clean driving record. I am an excellent driver, still. However, if I ever feel that I have "lost" some of my driving skills, I will stop driving. My husband is 80 and is still a good driver. I watch him, so don't worry. I will get him to stop if he does anything that would possibly harm another.
We have both passed health tests, eye tests and driving tests, so for now, everything is good.
Everybody is different. There are people of our age who have serious health problems, and others who have serious eye problem. I agree that there should be mandatory driving tests for seniors every year, because no two people are the same.
I would add here however, that is you stopped using words like "crazy old drivers", which means disrespect to all seniors, you would probably get more positive answers.