As unemployment rates go down, economists begin to explore what it would take to get more people working for longer.
This research concludes that flexibility in working hours, controlled by the person working would make a significant difference in total effort available for work.
More flexibility in working hours requires management and scheduling so that people who need to collaborate and interrupt each other agree on times and days for that, and that there will be other work time when they work alone. Some jobs are mainly customer facing, so the majority of the hours are interruptable.
People who have managed international teams on assorted time zones have a head start on understanding how to do this.
Vanguard sponsored research published by the American Economic Association https://www.aeaweb.org/research/older-workers-labor-force-tonetti-interview