I attended Chamberlain in St. Louis, MO and I can understand your concerns. When I started at Chamberlain, I was 29 and still in the Reserves, but I had been off of Active Duty for about two years. I will say that being an "older" male in a class full of early 20's females did not affect me in any negative one. If anything, some of them came to look up to me because of my military and life experiences. I made several friends in my class, as well, that I will probably keep in touch with for the rest of my life. One nice thing is that the men's restrooms are practical spotless from light use
Age and gender really wasn't an issue. I think the only time I would wish I was somewhere else was when they would talk about, you know, "girl stuff." Like boys and make up and all that stuff that will make a man look at his watch. You'll be fine, though. The level of maturity that you bring and your military training will be something you will be glad for. Another thing, too, is that you probably won't be the oldest in your class. There were students at my school in their 40's. Thirty-two is nothing, but a drop in the pound :)
I wish you the best and feel free to hit me up if you have any questions.