Though the search for eternal youth has long been the fodder for myths and legends, science has been pushing us closer toward extending healthy years of life and has set some people off on efforts to defy death altogether. Peter Ward, in his new book The Price of Immortality: The Race to Live Forever, explores a subculture of immortality seekers who have turned to cryonics, as well as efforts to merge man with technology as a way to escape death. The growing understanding of the biology of aging and advances in regenerative medicine, though, are creating the potential to alter notions of human lifespans. We spoke to Ward about his book, distinguishing science fact from science fiction, and the growing understanding of the biology of aging that offers the potential for extending healthy years of life.