In 2020, 74% of workers said they expected to work for pay after retiring from their regular jobs, but only 27% of retirees said they had actually done so. This large gap between expectation and reality has been fairly consistent in surveys over the past 20 years, and there is no reason to expect it will change. So it may be unwise to place too much emphasis on income from work in your retirement strategy.
Most retirees who worked for pay reported positive reasons for doing so; however, there were negative reasons as well.
Source: Employee Benefit Research Institute, 2020 (2019 data used for chart, multiple responses allowed)