There is another common change in us as we grow older: we slow down. This change is probably most obvious in our physical activity. But it is part of our mental life as well. Psychomotor speed, as psychologists often call it, is required by many activities. This is the pace at which we carry out all steps of an action, from sizing up the situation, figuring out what we want to do about it, and finally doing it.
Activities and tests that place a premium upon speed often show the old person at a marked disadvantage. He does however perform as well as younger people. But does performance in those circumstances reflect intelligence? When activities or mental tests are designed so that speed is not a significant factor, then the difference between old and young becomes much slighter. The old person reveals his ability to learn, think, remember and solve problems when not being rushed and when allowed to proceed at his own pace.