Why are we academics working so long?

A study shows that 25% of us --- me included --- intend to work until 69 or older:
https://www.insidehighered.com/news/2014/12/11/college-employees-better-prepared-retirement-general-population

Is it that our jobs are too easy?

Is it that we were set back by the Great Recession in '08?

Are we dedicated?

Do we love our jobs?

Please recognize that none of these categories is mutually exclusive!