The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU01375379
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Civilian Labor Force Participation Rate: With No Disability, 65 years and over [LNU01375379], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU01375379/, July 29, 2015.