Surely it's just a genetic lottery win? Humans certainly aren't designed to live that long and people with perfectly respectable lifestyles drop dead in their 50s and 60s every day.
I am not sure whether the secret for longevity lies in the genes or in the lifestyle. But you can't say that
humans aren't designed to live that long. There are references from 400 or 500 year ago, about people living up to 100 year or more. As the living standards increase, along with the advancement in the medical science, longevity will increase further.
Yeah because that people never eat something delicious like BigMac, French Fries, and coke lol. We need to change lifestyle and live in the village with fresh air to improve our life quality, but I don't see what's the point of we live that long if we can't take care ourselves anymore and just become a burden to our family.