Advice on dating a girl around 10 years older than me?

There is a girl at college that I asked out to a date, she said yes, we went out, and had a good time and are planning to go out again. However, I did not realize at the time that she was a good ten years older than me. She is quite an athlete and very young looking, so it came as a total shock to me when she told me she was 28. Which is where the second rub comes in, I am about to turn 18 this summer, but don't bother me with the 'legality' part, I believe in saving myself till marriage, so that is not a major issue here, but as life experience and maturity goes the difference between a 17 and 28 is more profound than say 27 and 38. I really do like her, and I sense there is some connectedness between us. Couple more things, I am a rising sopre in college, so at that level I feel we are pretty similar, and everyone (including her) confuse me for being at LEAST 2-3 years older than I am, with some even more drastic guesses. So I would appreciate your thoughts...thanks