Is it wrong for a 23 year old girl to date a 17 yeah old guy? He's 18 before she's 24? Is it weird?

Are you asking about sex or dating?

Are you asking about legal or weird?

I don't know what a 23 year old, presumably in College or a career, would talk to a 17 year old high school student about.

Would I be unhappy if I were the parent of either person?

Yes.

I find your wording odd - a 17 year old MALE with a 23 year old GIRL.?

I can't imagine what a woman would see in a 17 year old guy.
I think it's weird. As parent I would be upset by it.

I can't say it's "weird", but it really doesn't make much sense. The 23 yr old girl must not like older men very much, or she really isn't trying to have an older boyfriend. More power to you, man... best of luck.

Since men mature slower than women, I would consider it somewhat unusual in general.

But nothing really extremely weird.