Most Helpful Girl
I don't see a problem with it at all, you're basically the same age.
Most Helpful Guy
As a general rule, if you are both in high school, you are both within age range of each other. When you're sixteen, going on seventeen (sorry, had to make that reference), you're worrying a lot about is this right, is that right, what the heck should I do? Here's the thing: yes, she's two grades lower than you; yes, she is about one year younger than you, but you are both in the same age group and are not so far apart that you don't have anything in common. Don't worry.