It's like getting upset that there are no 5'2 guys playing in the NBA. Although height is not a job requirement, if you don't have it it is highly unlikely that you will get the job, unless you can demonstrate that you have other skills to make up for height (speed, highly accurate shooting, and a 5' vertical jump for example). To bring the analogy back to ycombinator, I'm pretty confident that a woman that shows up with only 6 months experience hacking, but she already has a decent chunk of her product built, that the ycombinator crew will consider her application very seriously, because she would have already demonstrated that her lack if experience was not a handicap to her hacking.