Early memory loss
People in their 20s don't usually complain about forgetting names or phone numbers, or having trouble learning something new. But that's when memory and mental energy first start to decline, says Denise Park, director of the Center for Aging and Cognition at the University of Michigan Institute for Social Research, USA, claims in his research. While studying more than 350 people between the ages of 20 and 90, he found that mental ability declines continuously in processing power starting as soon as the 20s. This reduction in cognitive capital is not noticeable until the loss is substantial enough to affect everyday activities.