Scientists with the SuperAging Research Initiative are studying a group of superagers — people 80 and up who have the memory of people half their age — to understand what helps them stay sharp. We speak with Morry Kernerman, a lifelong violinist who’s 101 years old, and still hiking, travelling and teaching music, and with Angela Roberts at Western University in London, Ont., who’s leading the study in Canada, about how biology and lifestyle contribute to aging well.