http://articles.mercola.com/sites/articles/archive/2008/01/02/lifespan-part-two.aspxHuman lifespan is probably more influenced by lifestyle and other environmental factors than by genetics. Studies of insects and rodents have shown that genetic mutations can modify lifespan. But studies of identical twins suggest that heredity accountsenCommunityServer 2008.5 SP1 (Build: 31106.3070)