The Boston College Center for Retirement Research recently published a report examining the benefits of taking on nontraditional work during the years of retirement. Nontraditional meaning without health and retirement benefits. The results suggest that as long as health allows, working longer is financially and socially beneficial for seniors.
It makes for suggestive reading for those considering retirement or planning ahead. https://crr.bc.edu/wp-content/uploads/2020/10/IB_20-15_.pdf