Going back to school... at my age.

I have always liked school. My sister used to tell me that I was weird because I liked school. I have always felt that school is important. I have always wanted to teach. I used to picture myself as a high school english teacher. Probably because I had a really cool teacher in high school and she made it look like a great job. She had a real influence on me and my interests, although I don't think she ever knew that. Anyway, I have wanted to go back to school for the last ten years. I was attending Weber State University when I got pregnant (yes on purpose) and with the circumstances of my children's birth it made things a little difficult. We are finally at a stage when I can start thinking about it again. I don't aspire to do as much as I wanted to in the past, but I am looking at a trade school of sorts so that maybe I can get to do something I like to do, rather than something I am settling on. Here is my issue... I am almost 35 years old. I don't want to be the old lady in the class with a bunch of 18 year olds. Good grief, I am old enough to have a teenager of my own! I also don't want to be looked at as the "mom of the class". I wouldn't mind making a few friends but maybe someone my own age group would be nice. I have been saying to S for  a long time that it is my turn to go  to school, but I feel that if I don't go soon that ship will have sailed. If I do go this will be a year and a half of frustration not only for me but for my family as well. I will have to get someone to watch my girls for the summer, be gone every saturday from 9 am until 5 pm, not to mention the money issue. The question is whether or not it is worth it. This is something that I have always thought I would enjoy, but what happens if I spend all the time and money and find out that I hate it? I am a firm believer in higher education, but is trade school really considered higher education? These are the questions that plague my mind right now. If anyone has any advice I would love to hear it.