A Senior dating a freshman isn't exactly unheard of, still it's a little weird. I dated a Senior girl when I was a Freshman in high school for about 3 weeks.
I suppose there's nothing wrong with taking her to a dance, but if you have any intentions of having a physical relationship at all I would make sure to check the laws in your area.
I suppose there's nothing wrong with taking her to a dance, but if you have any intentions of having a physical relationship at all I would make sure to check the laws in your area.