I have witnessed the "you just never know" situation a few times this year. My sisters fiances mom passed away from a brain aneurysm. Very healty, 60 years old, never smoked. Happened while she was driving and she was gone by the time she got to the hospital. In another situation a fellow cyclist died in his sleep of a massive heart attack at age 42. Again very healthy, active and never smoked etc. Just goes to show you never know when your time is up.