As you age, some slowdown in memory and processing is to be expected. That can mean a forgotten birthday, an accidentally retold story, a temporarily misplaced wallet. Such run-of-the-mill forgetfulness may increase over the years but is usually not — as you may fear — a sign that you’re on the road to a condition that can seriously impair memory and thinking, such as Alzheimer’s disease. Still, small thinking slip-ups are inconvenient and can sometimes