I'm in the same boat as you!!!
Also as Friffinghell mentioned, a lot of the "mature" student events tend to be dominated by much older students (I know this because I actually started at the uni a few years ago but had to leave after a couple of months due to sickness so am going back to start this year, so I experienced it back then).
I think that the age group of mid 20's to mid 30's is quite tricky as I found that people were either much longer i.e. directly from school, or much older i.e. people with families who have decided to come to uni in their 40's and 50's.