Hello, My mom is 83 yrs old and every time I take her out to the store wherever, if she sees someone walking down the sidewalk, riding a bike, looks at a license plate, or a car, she will say everytime we saw these same people or car the last time we were out. We live in a big city, and I haven t ever seen this car, person, etc. Is this a sign of alzheimers. I am just trying to figure out why she does this.