A great friend of mine, joined as a 23 year old Junior my junior year. She had a year and a half of great times and loved it. However, you have to remember, your pledge class is going to be 40 or 50 18 year olds, who are worlds apart from you in age and life experience. I am not trying to talk you out of it by any means, like I said my friend loved it, and she was older than most of us. Just remember those things. You will also have 19, 20, 21 year old women running the chapter and telling you what you can and can't do in many cases. I don't think I would enjoy that, but if you do, then rock on sister!! I hope you are sooooo happy with whatever you decide!!