Silver Book Fact
About 80% of the senior population has 1 or more chronic conditions. Because of these conditions, 25% are limited in their ability to perform activities of daily living.
Goldman D, Cutler D, Shang B, Joyce G. The Value of Elderly Disease Prevention. Forum for Health Economics & Policy. 2006; http://www.rand.org/pubs/external_publications/EP20060026.html