I think it's nice to age gracefully. OK, you lose the youth, a certain stamina and dewy glow, but what you gain on the inside as a human being is wonderful: the wisdom, the acceptance and the peace of mind. It's a fair exchange.
Human kindness has never weakened the stamina or softened the fiber of a free people. A nation does not have to be cruel to be tough.
I have a road bike and a mountain bike, and I tend to use them both a lot. They help you keep your balance and your stamina.
Sometimes we may ask God for success, and He gives us physical and mental stamina. We might plead for prosperity, and we receive enlarged perspective and increased patience, or we petition for growth and are blessed with the gift of grace. He may bestow upon us conviction and confidence as we strive to achieve worthy goals.