TL;DRAbstract
According to the Centers for Disease Control and Prevention, the average life expectancy of Americans reached 77.6 years in 2003, the highest level ever, and the projected trajectory is upward (CNN.com 2005). Additionally, the median age of Americans has risen from 30.0 years in 1980 to 35.7 years in 2002, an increase of nineteen percent (U.S. Census Bureau 2004). During the same period, the percentage of the population aged sixty-five and older has increased from 11.28% to 12.35% and is predicted to exceed twenty percent by 2050 (U.S. Census Bureau 2004). That is, as a consequence of medical advances and an altered lifestyle, Americans are living longer and, because of the ongoing decline in the fertility rate, elderly Americans comprise a larger and larger proportion of the population. It is not surprising, then, that the elderly have become the target of an increasing volume of research.
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According to the Centers for Disease Control and Prevention, the average life expectancy of Americans reached 77.6 years in 2003, the highest level ever, and the projected trajectory is upward (CNN.com 2005). Additionally, the median age of Americans has risen from 30.0 years in 1980 to 35.7 years in 2002, an increase of nineteen percent (U.S. Census Bureau 2004). During the same period, the percentage of the population aged sixty-five and older has increased from 11.28% to 12.35% and is predicted to exceed twenty percent by 2050 (U.S. Census Bureau 2004). That is, as a consequence of medical advances and an altered lifestyle, Americans are living longer and, because of the ongoing decline in the fertility rate, elderly Americans comprise a larger and larger proportion of the population. It is not surprising, then, that the elderly have become the target of an increasing volume of research.
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