Your body isn’t getting any younger. That’s a good thing because if you weren’t getting any older you would have big problems. However nature and gravity are working to pull you back into the ground so you can push up the daisies. It’s a constant battle between you surviving and nature recycling you. The best way to fight nature is to stay healthy and strong. Strength comes from training, either from your activities of daily living that require physical strength that you use regularly, or from working out and training to be stronger.