My daughter started her degree after a year out and was worried about being a bit older, but once she started she actually found that not only were there loads of gap year students, in fact there were also a load of people doing a second degree or starting after deciding on a career change in their 30's and 40's!! So not only would you most probably not be the oldest on your course, you will find other "mature" students doing other courses and will have no problem finding people of your age. But having said that, you're only 22!! There is no reason why you should't get on with the younger students. If you don't make a thing about it I don't think they will.