Japan is aging rapidly, and its government has been groping with the implications of this profound social change. In a pioneering study of postwar Japanese social policy, John Creighton Campbell traces the growth from small beginnings to an elaborate and expensive set of pension, health care, employment, and social service programs for older people. He argues that an understanding of policy change requires a careful disentangling of social problems and how they come to be perceived, the invention (or borrowing) of policy solutions, and conflicts and coalitions among bureaucrats,...