The average age of United States farmers has been increasing for 20 years. The objective is to examine the factors associated with hours worked among farmers age 50 and older. A cohort of Kentucky and South Carolina farmers (n = 1394) over age 50 were surveyed annually during 2002-2005. Of those that reported any farm work, males worked 24 mean hours/week and females worked 14 mean hours/week. Greater satisfaction and more experience farming, increased acreage, and presence of animals significantly increased estimated hours farmed, whereas chronic health problems, although prevalent, had a minor role in determining work hours.