The mind is not different from the body. It requires daily training. Only through regular use will it continue to function well. Just as the body maintains its power and endurance and agility from regular exercise, so does the mind. Mental fitness, like physical fitness, encompasses diverse capabilities of the mind including memory, creativity, reasoning, observation.
Studies suggest that losses vary in individuals.
Men may have more problems with vocabulary. Women with problem-solving. We should plan our day so that our mind is put through its paces the same as our bodies. We are told of any number of old people who produced works of genius at an advanced age. On inspection they prove to be people who attend to the care and feeling oif their minds.