The only thing here is you're well over drinking age and she is awhile away. If that's part of your lifestyle it could be an issue. Otherwise if there's a difference in maturity that's the goal of dating, to find that out. 6 years different may seem big now but it's really not.
Taxis are expensive and have the fuel issue per the post were replying to. They were pretty long winded but busses do take longer than driving yourself that much is true.