Unlike groceries, we don't have "Use by or Expiration dates" anywhere on our bodies so we just go about doing our thing until our "tank is empty like a car without a gas gauge. I'm still amazed I'm still chugging along approaching the 83-mile mark while I've passed so many others. Does it depend how hard or cautious you drive, the traffic you're in or just how well you keep mechanically fit? It's a long journey, the places you've been, the sights you've seen cannot be forgotten or repeated but where's the final destination, who knows. Just enjoy the trip.....I'm just saying