Technology not yet created would be key to extreme longevity, as we would need to be able to eliminate aging at the cellular level. DNA repair and reprogramming cells are the only ways to grant impressively different aging outcomes. If humans living for 1,000 years seems like a complete stretch, aging expert João Pedro de Magalhães will do you one better: how about humans living for 20,000 years? To figure out how to stop the cellular aging process in its tracks, humans need to be a bit more like a naked mole rat. “I actually did some calculations years ago and found that if we could cure human aging, average human life span would be more than 1,000 years,” he tells Scientific American.