The first barn I boarded at, we started with about 15 boarders. I was the only teenager although there was one girl in her early twenties. There was so much drama you would never believe! It was mostly between the BO and each of the boarders but what would happen is that they would all get together and gossip about the BO and tell stories and take sides. I stayed out of it completely.
In the end, 90% of them left. There were three women and me but then I left. Unfortunately the three women who stayed were the three who were never at the barn. Although this was awesome for me (come on, who wouldn't be thrilled with an entire 20 stall barn, indoor arena, outdoor arena, turnouts etc. all to themselves?) Most of the time I was the only one there and the BO basically let me have the run of the place because she liked me and knew I didn't get involved in the drama.
Now that I'm off at school I found a new barn to keep my girls. I love this new place and fortunately there is not a whole lot of drama. Aside from the turkeys escaping and wreaking havoc! All the people there are great.
I think it really does depend on how many boarders, how many teenagers, the type of barn, and the BO. SO many variables!