What determines who will live to be 100 with sparkling eyes and a sharp mind? Is it a lucky genetic combination, environment, diet – or something else entirely? While the world obsessively searches for the magic formula for a long and healthy life, scientists increasingly believe that one of the key factors is much simpler than we think – and that we carry it within us from birth. Science has revealed that individuals with this blood type are much less likely to have a heart attack, stroke and premature aging. The secret to longevity may indeed be in your veins.