In the first place you should just go with what women actually say they prefer instead of trying to rationalize your own choice. That said, if you want another

In the first place you should just go with what women actually say they prefer instead of trying to rationalize your own choice. That said, if you want another reason, how about that it's quite all right to use the term woman to refer to a woman who is participating in a startup even if she has not reached legal majority. It is preferable to call a girl a woman than the other way around.