Age was another input into the model. However, it's no surprise that the signs of aging correlate strongly with Alzheimer's. While one 70 year old in very good

Age was another input into the model. However, it's no surprise that the signs of aging correlate strongly with Alzheimer's. While one 70 year old in very good mental/physical health may be very active including driving, another may seem and "act" a lot older. In particular, Driving from point A to point B depends on a certain kind of memory that degrades quickly in Alzheimer's. Forgetting names is one thing but forgetting whole places is another. * Making abrupt changes: perhaps they are suddenly recalling something they need to do like turn onto a certain street? Not quite sure. * Driving at night removes a lot of visual cues putting an even larger emphasis on memory. * Longer travels & having more destinations both depend on memory so that one makes sense.