Nathaniel David, CEO of Unity Biotechnology, speaks at Hello Tomorrow Global Summit 2016 senolytic medicines, which clear senescent cells from the human body. These “old” non-dividing cells accumulate in the body with age and secrete inflammatory molecules, driving a number of age-related afflictions. Unity has shown in animal models that by removing senescent cells we can reverse or prevent many of the diseases that define what it means to be old — diseases such as osteoarthritis, atherosclerosis, and kidney disease.