The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU04000097
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Rate: 65 years and over [LNU04000097], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU04000097/, July 3, 2015.