Retirement doesn't necessarily mean passing time meaninglessly; it can also mean getting to choose the most meaningful ways to utilise one's time.

See also σχολή, https://en.wikipedia.org/wiki/Otium , and especially Russell, "In Praise of Idleness"

(compare also the independence from economic interests espoused by https://en.wikipedia.org/wiki/Humboldtian_model_of_higher_ed... to the dependence upon economic interests espoused by TFA)