Among U.S. workers aged 65+, about half (46.2%) work 40 or more hours per week, while about one-third (34%) work 20-39 hours, and one-fifth (19.8%) work 1-19 hours, according to a 2013 AARP analysis of Census data.
AARP. (2013). Workforce profiles: Selected characteristics of U.S. workers and non-workers age 40+. Washington, DC: AARP. Retrieved from www.aarp.org.