When respondents aged 50-61 were asked to estimate the probability of working full-time at ages 62 and 65, "on average, 48% expect to work full-time at age 62 and 28% at age 65.9," according to a 2014 analysis of Health and Retirement Study data.
Khan, M. R., Rutledge, M. S., & Wu, A. Y. (2014). Do longevity expectations influence retirement plans? (Issue in Brief No. 14-6). Chestnut Hill, MA: Center for Retirement Research at Boston College. Retrieved from crr.bc.edu.