Rave community? I'm guessing you mean a 27 year old that still considers herself quite young. I couldn't care less if she still considers herself a part of the rave community. I'd date her for who she is as a whole.
Nope, I have no problem with a 27 year old being in the community, but that's just not something I partake in. It probably wouldn't make sense for someone who loves to rave to date someone who doesn't anyways.