http://medical-dictionary.thefreedictionary.com/frail+elderly Biden meets all the criteria for those who are determined to say he is not.
At what age are you considered old? Interesting how it changed over the century... http://www.cbsnews.com/news/what-age-is-considered-old-nowadays/
http://coolconversion.com/heath/life-expectancy-calculator-us/I-am_76_years-old.-What-is-my-life-expectancy%3F_m Life expectancy chart, just plug in your age and sex and will tell you how much time you have left
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