Since the mid-1990s there has been a dramatic shift in the part-time versus full-time status of the older workforce.
The ratio of part-time to full-time employment among older workers was relatively steady from 1977 to 1990. Between 1990 and 1995, part-time work among older workers began trending upward with a corresponding decline in full-time employment.
But after 1995, that trend began a marked reversal with full-time employment rising sharply. Between 1995 and 2007, the number of older workers on full-time work schedules nearly doubled while the number working part-time rose just 19 percent. As a result, full-timers now account for a majority among older workers: 56 percent in 2007, up from 44 percent in 1995.
Bureau of Labor Statistics, U.S. Department of Labor, The Economics Daily, More seniors working full time at https://www.bls.gov/opub/ted/2008/aug/wk1/art03.htm (visited December 08, 2023).