I'd like to think good health and good eating would give us longer life, but there's always a randomness factor in there. Jim Fixx, the guy credited with "inventing" jogging for fitness died of a sudden heart attack at age 52... while jogging.
For now, I just focus on remembering and being grateful for the moments we DO have, and not taking anything for granted.
RE: Reflection: Life is Fragile! Enjoy and Appreciate it While You Can!