Specifically, those with preclinical Alzheimer's tended to drive more slowly, make abrupt changes, travel less at night, and logged fewer miles overall, for example. They also visited a smaller variety of destinations when driving, sticking to slightly more confined routes.

Isn’t this pretty much everyone as they get older? Who hasn’t seem these traits in older relatives?

Everyone I know who gets older tends to drive less at night because as you get old your eyesight gets worse —- particularly if you’ve had cataract surgery, which are people who are in the study / risk group.

Unless I missed a more nuanced point this article reads like “old age is a good predictor of Alzheimer’s.”