When talking to women older than me...any time they give me crap about my age i do this
example:
Her: (something like) "you're a bit younger than me"
me: "and you're a bit older than me

"
me: "but we're still getting along:P (or something like that)"
Usualy with mirroring the coment about my age works and you're not being rude, because she started it:)
But I really doubt that this girl will want to meet you. You started of on a wrong foot and to be honest, you didn't do well in the following conversation. You're topics were way to serious, there good but not for getting to know each other.
So if you're about to meet her, you should go someplace where you can do something (besides sitting and talking. I wouldn't go to a bar). That way she won't think of your date as really boring.