Everyone in my family is left handed except for my dad who was forced to become right handed as a kid... (They made him eat with an L shaped spoon and fork that would only work in his right hand)
I have always been under the asumption that right handed people do live longer than left handed, although I have also heard that lefties are more intelligent... but who knows, right?
I dont know about the longevity but I heard that left-haned person are smarter than right-handed though.
I'm left-handed, but can also use my right and when my days are coming closer to the end, that's when I will learn to just use my right-hand. Sorted.
I am left handed when I write, right handed in everything else (though I think that has to do with my vision more than my hand dominance). Right handed people do not live longer than left handed people. The scientific study that this was based on hit the papers big, but when the shoddy research was exposed it made barely a ripple in the news. The study that made this claim looked at the average age at death. The problem with this is that the study failed to take into account that until fairly recently left-handedness was strongly discouraged (to the point of being beaten out of countless Catholic students). So the proportion of elderly left handed people to the general population was lower than the proportion when looking at youth or even middle aged people. So, because there were a much larger number of younger left-handed people than elderly left-handed people the average age at death was lowered. When you account for this, the difference is statistically negligible. So, we're smarter and live just as long.