So.... a few texts later and it looks like

1. He doesn't know how old I am
2. I'm 99% we're going out (as what I don't know) on Monday
3. I think he likes me - or did before he found out how old I am.

-

1. Yes I told him how old I am
2. If he doesn't like me because of my age then he's not worth it

And there you go - you're filled in. :)