QUESTION ONLY FOR WOMEN OVER 30, OR MAN UNDER 23 WHO'VE HAD EXPERIENCE WITH 15+ WOMEN OVER 30?

I'm 32, and I would not date someone that young. If she's not even paying any attention to you, more than likely she is not interested. If you want to know though, just go up to her and tell her you've noticed her in there before and ask if you can buy her coffee. That simple.