U.S. LIFE EXPECTANCY IS up to a record 77.9 years. “We are making gains against some of the big diseases such as cancer and heart disease.” But there’s also this: “Conventional drugs and diet can only take us so far. What we need for bigger steps toward longer lives: Rejuvenation therapies. We need stem cells, gene therapies, immune therapies that remove accumulated junk, and nanodevices that do repairs. When do these therapies start hitting clinics and hospitals in substantial numbers? Hard to say. But experiments on animals with some of these therapies make me think most of us will live to see these therapies hit the mainstream.” Let’s hope. Faster, please.