How long we live tends to run in families we believe but genetics has far less influence on lifespan than previously thought according to a new study. Yes our DNA plays a significant role and our environment too. The study has been published in the journal Genetics. The researchers analyzed an aggregated set of family trees of more than 400 million people. According to the IANS report the team used online genealogy resource with subscriber-generated public family trees representing six billion ancestors. The study suggests that the heritability of lifespan is well below past estimates which failed to account for