I work in hospice and see a variety of conditions. Some people in their 60's with significant mobility issues that are chronically exhausted, but then there's the patients in their 90's who just recently started cutting back on social events and activities due to injury/illness.

Seeing these differences was why I started roller skating (again) at 49 and increased other activities to keep my ass moving and challenge my coordination and balance. I want to get everything I can out of this life.

You can't control how or even if you will arrive at old age but you can swing the odds dramatically in your favor by the choices you make when you are younger. Eat healthily, avoid hard drugs and tobacco, drink alcohol only in moderation and get plenty of excercise that consists of four categories: resistance (aerobic), VO2 max (anaerobic), strength and stability.