Hey Caren, I can understand you being nervous but I'm sure your going to be just fine.
After high school I went straight to college and got my B.A. and then I took a year off and went back for my M.A. Now I'm debating on this license thing I've been working on. I think I need a break, lol! I've had so many mixed thoughts about my field and I almost feel like going back for something completely differen't.
We're about the same age (I just turned 27) and I wondered what it would be like going back to work on another degree. All of the students are usually so young. However, I thought back to that time and I remember having a few older students. Many were much older than 30 and I just loved them. One older girl actually became a very good friend of mine. She's actually coming to visit me soon. I think you're going to fit right in. It might take you a little longer to get used to the classroom type stuff but I'm sure after a few weeks it will be no big deal.
Good Luck with everything!! You're going to be fine.