Also gay, I think it is much more to do with our "delayed adolescence" and childless-ness. Or at least in the US that's what I see. The older I get, the more blessed I feel to be gay. I can move to any medium to large sized city tomorrow and probably find tons of guys in my age range that are looking for friends and shared-activity partners.
I have many child-free gay friends in their late 30's-50's and their social lives are often 5x those of their straight counterparts.