I think anyone that tries to look at longevity or anything else from the perspective that one factor controls an outcome has a major flaw in the logic they are using. In the case of identical twins just because genes are shared doesn't mean all of the other factors that influence longevity were the same. i.e. enviromental (toxic exposures, stresses and etc.), lifestyle and many additional factors one would have to account for when comparing "apples to apples"
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