If you want to keep your mind sharp, put down the crossword puzzle and take a brisk walk. In a recent study, 37 sedentary adults ages 57 to 75 took part in a 12 week program of supervised aerobic exercise. Overall brain function and memory improved. Blood flow was increased to parts of the brain linked to better mental function. No improvement was reported by the group that remained sedentary. Not only that, those in the exercising group reported improvement in as little as 6 weeks. A second study of 3500 healthy adults who began an activity program at age 64, 20% remained without chronic disease, mental depression, and physical limitations 8 years later. No matter your age, it's never too late to start an exercise program.
~British Journal of Sports Medicine, 2013