I have been a member of various bipolar and/or depression support online forums or in-person groups during the last 12 years. I, too, have noticed more females than males on the online forums. At in-person groups like DBSA (Depression & Bipolar Support Alliance) the male/female ratio was a little closer, with just a few more women than men.

I am a female, and I used to be a group leader for another website's Bipolar support group. Though that online support group attracted mostly women, it was kind of interesting that of the up to 9 group leaders, almost half were men. I'd rather not go into too much detail on why I think that was the case, but will say that the people in group leader roles had some form of leadership role or tendencies in past or current life.