Bill:
The older you get the more things in your body don't work the way they used to. It's frustrating because mentally you never think you are as old as your chronological age. Wishful thinking. Getting up in the morning is always an adventure for me as not all my body parts wake up at the same time!
Diet and exercise are the things that keep you moving.
Good for you taking charge of your life and congratulations on your success.
Kevin