It is so extremely variable. I have met old ladies that would die instantly and dissolve into dust if they heard someone "use the lords name in vain" ("God damn"), but until they speak I can't tell them apart from the old ladies that habitually curse with every breath they take.
I used to work at a nursing home where two old bitties were friends and would call each other removed all the time. They would just sit together and cackle while they talked.