I used 1995-2011 for the 20% pop. increase...according to the CDC new diabetes cases are up 98% over that time, and are currently declining. But I get your point, we may be in worse health in the last 10-20 years of life. It would require more study though....for example, middle age or younger people may have the highest incidence of diabetes. Also, diabetes rates track directly with obesity rates. Fit, lean seniors have other problems.
http://www.cdc.gov/diabetes/statistics/incidence/fig1.htm