Did your parents swear as you got older?
Growing up (meaning the first 19 years of my life) I hardly heard my parents say anything worse than the occasional "Hell", "Damn, or "Dammit" even when they argued and were screaming at each other (or me) at the top of their lungs they would sometimes say "Shit" but kept their language to a minimum. And even into my late 20's they didn't use the F word unless they absolutely had to (you can still say 'f'ing" if you're directly quoting someone, still gets the point across)
Now on my 30s they just stopped caring and now use all the words (even heard them using the Kyle LaRson word outside of quoting people), and sometimes you can just see how unnecessary these words are when they're used by your parents