Longevity, or the length of our lives, is getting longer. It has been for the last century or more as sanitation, medical and technological advances, and nutrition have continued to improve. However, we’re now moving into an area of prolonging life that sounds more science fiction than science fact. Still, some believe that centenarians (those individuals living to 100 or more) will be commonplace within the coming decades. Even if, Ray Kurzweil told Singularity Hub, we are unable to regrow or clone organs, nanotechnology is advancing to the point where we may be able to repair our bodies even as they break down. Indefinitely. However, there is still one very stubborn threshold for the human life, a number that no matter what advances we make, seems to be the upper bound of human longevity: 114.