1. Wisdom Quotes. Aristotle quotes. Available at: http://www.wisdomquotes.com/quote/aristotle-16.html. Accessed July 30, 2015.
2. 65+ in the United States: 2010,2014
3. United States Life Tables, 2010. National Vital Statistics Reports. Vol. 63, No. 7;Arias,2014
4. Centers for Medicare & Medicaid Services. National health expenditure projections 2013–2023, forecast summary. 2013. Available at: http://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/NationalHealthExpendData/Downloads/Proj2013.pdf. Accessed April 10, 2015.
5. Centers for Medicare & Medicaid Services, Office of the Actuary, National Health Statistics Group. National health expenditure data. January 2014. Available at: http://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/NationalHealthExpendData/index.html?redirect=/nationalhealthexpenddata/ Accessed April 14, 2015.