Advice on dating a 19 year old?

So, this girl and I met at school last year and had a few dates, and then didn't see each other for the summer, and upon coming back we went out again and agreed we are on date #2 or 3 or so. I'm in grad school and am 26, she is 19 and doing her undergrad.

My question regards her age and experience, and what to expect and what to watch out for. The age difference isn't a big deal for us, but I want to make sure I'm somewhat in tune with the mentality at that age.

From all of your expert opinions and experiences, what do I need to know here? I'm looking for this to work out long term.

Oh, she also hasn't kissed anyone and had one sort-of boyfriend last year but they just hung out and not much else.

Thanks for any pointers.
Updates
+1 y
She's not the party type so that helps. Thanks for the answers so far. :)
Advice on dating a 19 year old?
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