OK, here's my stats:
BP 120/80 ish
Resting HR 62
Total Cholesterol 3.8
LDL 2.2
Triglycerides 1.6
No smoking
Sane alcohol levels
BMI 23
no family history
no stress factors
well and fit, have never even had a cold in decades
That was the situation a while back when I had a full blown heart attack, went into cardiac arrest and had two stents in the "widow-maker" coronary artery. All without symptoms or pain. I once had an ingrown toenail that hurt orders of magnitude more than anything I experienced during this event. When I asked my cardiologist what he would have done if I had seen him a week before the attack, he said "Nothing."
I have lost all faith in the numbers that are supposed to indicate a safe zone. I have seen absurdly obese people and used to think they were a heart attack waiting to happen, and of course, it never did. I agree with the above poster: start worrying about something else. Just be ready to take your ride when they punch your ticket cuz there's probably little you can do about it anyway.