I don't think I've worked with a female developer peer either. Those women twenty-five years ago (I erred in saying it was only twenty) were senior to me. What's really scary is that we do have a few female developers on my team now . . . in Bangalore. Here in the US, we've actually fallen behind in terms of maintaining an environment that's appealing to developers who aren't young, (culturally) white, and male. That does not augur well for our future.