I generally agree with your assessment. But I think there may be more East and South Asians than you think, more 36-80s and more 15-19s too. I have no reason to think we are underrepresented in gays or in deaf people.

My general impression is that women are not made welcome here - the level of overt sexism is incredibly high for a community that tends to frown on chest-beating. But perhaps the women should speak for themselves on that subject. Or not. Discussions on this subject tend to be uncomfortable, Sometimes it seems that the only good they do is to flush some of the more egregious sexists out of the closet.