Would you like to live 35 percent longer? Apparently the trick is removing worn-out "senescent' cells that have a degenerative affect on your body. "Cellular senescence is a biological mechanism that functions as an 'emergency brake' used by damaged cells to stop dividing," says Jan van Deursen, Ph.D., Chair of Biochemistry and Molecular biology at Mayo Clinic, and senior author of the paper. Scientists added a suicide gene to genetically modified mice, giving them a drug that targeted senescent cells. Treated rodents lived between 25 and 35 percent longer, and were also healthier: they were more active, and had better functioning hearts and kidneys compared to the control group.