…Biogerontologists like Aubrey de Grey, author of Ending Aging, believe that living longer is a fairly straightforward engineering problem: Find out what breaks and fix it. De Grey promotes an approach he calls ‘Strategies for Engineered Negligible Senescence,’ or SENS. It identifies seven specific breakdowns and attempts to attack each of them in turn. He and others are researching longevity with support from nonprofits and an X Prize approach aimed at extending the life span of mice. (Researchers call it the Mprize, a reference to their quest to engineer the ‘Methuselah mouse.’) I certainly wish them well—after all, I’m not getting any younger—but de Grey says that it will probably be 20 or 30 years before we see effective anti-aging drugs on the market…