I doubt that it's luck. I suspect lifestyle difference has more to do with it, like the amount of exercise and diet. Obesity has replaced smoking as the number one health threat in the US. You don't see any eighty year old fat people over here. That's surely not because the fat people are going on a diet at sixty. Their hearts can't survive the sugared drinks, donuts, hamburgers and french fries so they make their early contribution to holding down the mortality rate. :-).