As a pp pointed out though, hen nights can be just as rowdy.
It's not comfortable being on a train with any large group of pissed up people.
Not sure what age has to do with anything, should people know better after hitting a certain age?
I’ve probably seen it all in my many years. I’ve NEVER felt threatened by hen groups. Disgusted, yes, threatened, no. (and PLEASE wear knickers!)
Pissed up people, egging each other on? Quite frightening at times. I texted BTP on one train the aggression was so bad. They did a brilliant quick removal two stations later. (Euston bound, late at night) Peace at last… 
As for age being relevant, surely you expect maturity to kick in at some point?
Meh
Were you hurt or abused?
Err, you have to actually be assaulted for public alcohol abuse to be a problem do you?
I hate it. I can't stand football.
Missing the point a bit here.
We need to ban alcohol from public transport. There's no reason or need for it to be on board. I used to commute by train and every single time there was someone breaking out a 6 pack at 7.30am. If you can't get through a train journey without an alcoholic drink, you have a problem.
I used to go to Torbay to visit my mum two maybe three times a year. The outward trip was usually good, except at Glastonbury time. I’d stay a couple of nights and return on an evening train.
Many times in the evening young men were getting rid of 6-packs like crazy. One guy, on his own, worked his way through his Fosters pack, and then unbelievably reached down and got another from his bag. Three cans into that, it was his stop. In the dark, the station lights lit up the platform and a row of cars in the car park. Straight through the gate, he unlocked his car and got in the driver’s seat… 
God the toilets can you imagine? Covered in urine…
That, unfortunately, reminds me. Another, similar train trip to above. Three guys knocking back cans, standing right next to the auto door/luggage area. As a result the door remains permanently open with all the racket that goes with that.
Their revolting conversation was deliberately aimed at upsetting people. It became obvious at one point that one of them decided the trip to the adjacent toilet was too far and he just relieved himself in the luggage corner.
Newton's laws of motion ensured that a stream of orange fizzy piss ran down the linoleum aisle. The smell was awful. I got ahead of it in the other direction, and luckily I was only two stops to home…