The ending could be a few ways.
1) Cash-out, die of old age, etc., then go upstairs where judgement is handed down.
You either go to heaven or are sent south.
2) Cash-out, die of old age, etc., then go upstairs where judgement is handed down.
You are deemed to have arrived too early and are shipped back to the same decaying body from which you tried to escape. (Doctors resuscitated you or gave you an antidote)
3) Cash-out, die of old age, etc., then go upstairs where judgement is handed down.
You do not go into heaven and are not sent south. Instead, you are reincarnated, forced to walk the planet in solitude, living a meager life in service to others for the rest of your days. (Note that this method removes one's ability to cash out ever again; you are forced to finish the game).
4) Cash out, die of old age, etc.
You go into the ether, cremated or buried, with no light at the end of the tunnel, no judgement. (You find out there is no higher power.)