Some people think vitamin E, at least 400 units a day, may prevent or postpone the development of Alzheimer's disease. They recommend taking vitamin E for this purpose. I do not recommend vitamin C like many people do, because I am not convinced that there has been proof that it helps. Many people take that, however, and it won't hurt. Right now it is probably wise not to take extra vitamin A, because some of the recent research has suggested, at least in people who smoke, that it might actually be dangerous.
Most nutrition is moderate and common sense.
I read that Motor vehicle accidents are the most common cause of accidental death among the 65 to70 age groups and the second most common cause among older people in general. I don't know that statistic, but I would not argue with it. Many people find it very difficult to give up driving as they age, but in fact, some people become dangerous to others when they loose their ability to drive well. This happens because of failing eyesight, slowed reflex time, and unfortunately, failing judgment in memory. I think the most important question is to determine whether the doctor is treating the person or the disease.