Replying to Too young?

Hey NS, I have a dillema.

There is this girl who is in to me after some party (I'm awesome when I'm drunk).
She is really nice, friendly, into the same things as I am and she is hot.
Like a 8.8, great body and perfect ass.
(no pics bitches you better belive it.)

Now is the catch that the thread title suggests, she is 15, almost 16.
She doesn't look nearly 16 more like 17.

I'm 20 but I look younger like 18/19.
I know the divide by 2 plus 7 rule. which would come to 17 for me.

I do not go to her school and we share the same bunch of friends, mostly 19/20 year olds.
Should I go for it? Or is the age gap to large?