Introduction to "Health at Older Ages: The Causes and Consequences of Declining Disability among the Elderly"

David M. Cutler, David A. Wise, and Richard G. Woodbury, Health at Older Ages: The Causes and Consequences of Declining Disability among the Elderly (University of Chicago Press, 2009), https://www.nber.org/books-and-chapters/health-older-ages-causes-and-consequences-declining-disability-among-elderly/introduction-health-older-ages-causes-and-consequences-declining-disability-among-elderly.