As I get older, my body becomes less mobile and not as strong. I am working at slowing that process down as much as I can. I take vitamins and various supplements, watch what I eat, keep my weight down, and exercise. I think I am doing pretty well at 77. I just got back from a three-day drift/fishing trip where I rowed a pontoon boat 8 hours a day, slept on the ground, and loaded and unloaded the boat each day. But as I get older, my main concern is my mind. I see so many seniors getting feeble in their thinking. I think that, as far as I can tell, my thinking and reasoning ability is as good as it has ever been. As with our physical bodies, if we do nothing, age will win. My plan to keep my mind young and sharp is the same as my plan for my physical body: exercise it strenuously. I read a lot, and I read a lot of difficult books to improve my vocabulary and reasoning. I write a lot. The best discipline for learning to think in a straight line is writing. Anything that I speak in public as teaching, I first write. I read the Bible a lot; it is the mind of Christ. I memorize scripture for at least 30 minutes every day. Memorizing works our minds and makes them stronger.