Working in a Dr's office, (most of our patients are elderly) I see how the mind is affected on a daily basis.
So I am asking a PT people, please, please, please for the safety of all do not let your eldery relatives drive if their Dr has not ok'd it.
The mind changes so quickley within 6 months to a year your mom and or dad can go from able to drive and live alone to not reconizing their own grandchildren.
I know first hand how stubborn and determined the elderly can be in holding on to their independence which most often means driving.
Yet if you saw them drive, went along with them for a car ride you would understand that not only is their life at risk but the public's as well. I cringe, every time some old person comes into the office with a walker, not being being able to hear or see and they drove to the office proclaiming proudly "I am 88 and still drive"
Please have their Dr check them every year to make sure they are ok, have the eyes, ears and general PT check them and most important go along on a car ride with them and see how they handle it. Yes they might be mad at you for taking their license away however your gilt will be much greater and the pain deeper after they kill themselves and some innocent person.