I am 18 years old and I never really have any trouble when I try to get a girl have something with me. I know how to speak my way into attracting them, since my physique is not my strength, though I'm working on it.
Usually I am not attracted to women older than me, until recently when I met a co-worker who actually takes the same bus back home. (I work at a huge company with over 7,000 employees). She is 23 years old. I had been noticing her for a couple of months now and I have spoken with her for the past 4 days, she actually now sits next to me because she expects to talk on the way home, which is about one hour. I have been playing the cocky and funny game in order to build up comfort, and it has seemed to work, as she now prefers to talk to me rather than any other person in the bus. My problem is that I am struggling to see how I continue this. She has said that I look very young, like 17-18 young. I don't think it is a good idea to continue with the c&f style as it would stimulate this point of view for her but I dont want to bore her out either. It doesnt make any sense to continue building up rapport and making an effort if she will see me as a funny kid and would never want something with such person.

Any suggestions here?
Thank You,
Aquiles.