"a society that uses time from one's lifespan as its primary currency"

That's just wages with fewer steps.

People trading their time for money?? What an inconceivable future society! :D

I was going to suggest something closer to https://en.wikipedia.org/wiki/Repo!_The_Genetic_Opera

Isn't that just Michael Ende's Momo but with extra steps?

"End-stage" is when there is no revolution because greed has killed everyone already.

Revolution is what the would-be proletariat persistently, but perhaps delusionally, assumes it will win (despite the 1% being able to afford more than enough bullets)… end-stage is when the cancer has gone past the point of fighting and you just have to resolve yourself to (in this case human-societal) death. A good sign it’s too late to seize the means of production is when the workers have medical devices that require an active and paid up subscription.

Dunno, Elon and Bezos seem to be doing their damndest to push past the red line. A pacemaker with an LLM you can chat with would also be a good sign we’ve passed the point of no return.