I didn't worry about the social side of things. At 44, I was never going to be part of the full student social life - I did that when I was their age, so twice would be greedy!
I just studied and chatted to other students over the course of the first year. It was pretty lonely to begin with. However I was just part of the furniture by the second year. They got used to me and I joined their pub quiz team, went round to student houses for pizza + movie nights and enjoyed a couple of pre-Christmas dinners.
Just stay open, be approachable and see what happens. It might take a while, but that's OK. As a mature student, you have the resources to concentrate on your studies whilst things fall into place socially. I found that it wasn't something you could rush.
I never "clashed" with any of them - I had no reason to. There was no conflict between us. We just lived different sorts of lives.