CubDave:
It's not how long you live, it's the quality of life that you have, especially at the end. Healthly habits now will provide the best chance of avoiding a lot of 'stuff' and, especially, hospital visits. Hospitals are a good place to avoid unless it's absolutely necessary to go there and, hopefully, when you do go it's just to visit someone.
So, 80 or 85 is not the big thing, it's maintaining a quality of life that has you enjoying your short stay on earth.