Yes. The degree depends on the individual, but it's counterproductive to quantify it. First to go are names: of people, places, movies. We, I at 81 included, pass it off as a "Senior Moment". Curiously, the more the short term memory fades, the "way back when" memory sharpens. Stress interferes with clear thinking: stress caused by noise, personal relations, indecision and uncertainty. There is no question that attitude can help, but you can only fool Mother Nature so long. As Satchel Paige, the great Cleveland Indians pitcher, said, "Don't look back, something may be gaining on you."