You might be surprised. Where I'm currently studying, most of the students are older than me. (I'm 18 and most of the other students are between 20-25).
If not, I don't think you need to be too worried about it. You'll find very superficial people in each generation; you just need to search for the people who you feel most comfortable with.
When I went to study Japanese in Japan, I was expecting to meet a lot of North-Americans around my age at my language school, but most of the students were from other countries (Especially Korea and China) and pretty much everybody was over 25 years old. Not only did I have to deal with an age difference, but also a cultural difference. I won't say it's easy to adapt, but if I can do it I'm sure you can too!