Older with young class= left out

I am back at school and 35 with a class of close knitted 17,18 and 19 year olds that totally ignore me. They aren't mean or anything but I can't help but feel alone. I don't know how to approach them because we lack things in common and they are less mature. Any tips? I knew it would be hard but the segregation is hard... 2 years left. Ps: I do have great friends outside of school!