This article presents trends and changes in health spending by age with a focus on children, middle aged adults, and the elderly for selected years between 1997 and 2004.  The authors also predict selected effects of the future age-mix on healthcare costs.  

Hartman, M., Catlin, A., Lassman, D., Cylus, J., & Heffler, S. (2008). U.S. Health spending by age, selected years through 2004. Health Affairs, 27(1), w1-w12. 6 Nov. 2007. DOI: 10.1377/hlthaff.27.1.w1. http://content.healthaffairs.org/cgi/content/abstract/hlthaff.27.1.w1 © 2008 by Project HOPE. 

Authors: Micah Hartman, Aaron Catlin, David Lassman, Jonathan Cylus, Stephen Heffler