I'd be curious to see some demographics on that study. I think as you get older you get less of a kick out of swearing. When you're young it's just awesome and so much fun. As I've aged, I've noticed it's not nearly as fun and I just do it a lot less in general.
I can relate to that a bit, as I've grown up... what little that has been done anyway, only 17 right now, but yes, I have noticed it loses it's glamor eventually. Usually the only time I use it anymore is just when I am goofing around, I don't really make much mind of pain anymore so... unless I have broken a bone I usually don't swear about it.
I swear when things are going badly. Which is pretty much most of the time.
I get no enjoyment out of it whatsoever.
On the plus side, most of my neighbors leave me alone, I doubt that there are any of them that haven't gotten an earful. I think that most of them are afraid of me.
Probably afraid you will release the cows onto them.