My mom and step-dad are 15 years apart if you like each other try to learn more about her then ask her out. You can wait a year to do anything. Love is strong and it's worth fighting for. My girlfriend is only a year younger than me but I am 18 so we still have to wait.
Wait, listen, cha-ching. Run, Phlo has her shotgun pumped & loaded. The worst punishment would be corrupting a minor, as far as I know there's no jail time attached to it (it varies by state) I'd wait until she's of age, & as Phlo stated you don't know how she really feels. There's no problem being friends, & you'll get to know each other better
For 24, you're playing this rather child-like. 1) men do not "crush". That's something teen girls do. 2) 17-y-o girls may be attractive, but bring lots of drama. 3) the fact you are asking advice here shows a lack of testosterone-fueled desire for this girl. Indecisiveness = lack of balls. *** My advice: get the "man" lessons now that you should have got from your dad 10 years ago. If your dad (or uncles, older brothers, cousins) isn't available, find some guys who are skilled PUA to buddy-up with & learn from them.