Don't worry about it. I went in at 21 with no college prep classes at all from high school, graduated five years later and now I own a home in the west hills with a killer view, a pretty cool 95 300zx and I make a great living. You will be amazed at the number of older students you'll meet. Especially in this economy. Have a good life and enjoy college. It will go by quicker than the military. I promise.