I was an erasmus student in Ireland, and I was living in university accommodation with one postgrad student who was 28 and vietnamese. an other irish, 30, and one american girl, and two other were younger irish. Well, first off, I like to think of myself as not boring just because I'm an international student. My american roommate and I did a lot of activities with one of our irish roommates, so no, we were not just keeping to ourselves. Also, there were like 30 vietnamese on my floor, and my vietnamese roommate was always hanging out with them and speaking vietnamese while we couldn't understand, so yeah sometimes you can be unlucky and meet rude people, but other than that my roommate was nice, we would eat together or have a quick chat, but she was always with her friends otherwise. Honestly, it all depends, I learned a lot from my older irish roommate , as I did from my american roommate and other younger irish roommate. And not all " mature" students are boring lol, I'm 22 ( I don't even know why it's considered mature lol, I'm basically a baby) and about to start a postgrad degree in the UK and I'm SOO looking forward to start freshers week and do all the parties and stuff ( although in my country, where I did my undergrad, there's absolutely NO student life, so maybe that's why I'm happy to finally do the whole student life stuff , maybe some postgrads won't be as enthusiastic)