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What with nuclear weapons becoming more widespread with even small nations getting them politically the world looks less stable with a massive future war more likely but on the other side improvements in drugs making lifespans longer in the future. It's hard to predict how long we will live in future. We could all be dead in 5 years or maybe the average lifespan will reach 150 you never know. The way we are consuming resources and damaging the environment is another factor. Struggling to breath and high levels of pollutants isn't going to help us live longer for sure. So many factors are in play and lifespans could actually decrease in the future not improve.