Are you saying you have felt increased mental fatigue and "slowness" while aging? What is your problem--too much fluoride? Plasticizers? 450ppm CO2 dragging you down? Not enough mental exercise?

Some people peak early then just fade away--much like the football star who was the most popular guy in high school, who spends the rest of his life unloading trucks in a grocery store. Others keep learning and growing and become wiser with every decade. They were smart when young, and become intellectual giants in middle age or older.