I used to use the term "Old Boys Club" on HN, which was not well received, in part because most members here aren't that old. When criticized for that, I asked for suggestions for an alternate term. No one offered me any. "Boy Zone" is a term I learned on MetaFilter which gets used as a label for a male dominated environment. I am open to suggestions as to how else to succinctly describe the situation. But, so far, having been on the look-out for other terms for a few years, "Old Boys Club" and "Boy Zone" are the only two I know of. Both are guilty of using the term "boy."