Characters in BM don't die unless they are heroes or adventurers.
Or they lose a death duel badly, or they get themselves executed. Or you manually delete them.
But the older your character is, they get less and less hours and even a small wound takes weeks to heal.
Yep. My character Alanna, who's over 90 now, got a scratch in a fight with some monsters, and was wounded long enough to lose her positions after it got infected, and then the idiot surgeons botched their work and she began bleeding internally. (In other words, the regular wound became a serious wound, then a critical wound, before finally healing.)