beyond that i think it may be important to look at things from a more human psychological and sociological perspective. in every human culture young males separate into tribal groups (and this is even seen in other primates). i have a feeling that this drive to belong to a distinct group (a sports team, a gang, an underground music scene) may diminish as they grow older.
Hm, that's an interesting point, and I've thought about this as well. However it doesn't seem like this drive diminishes with age, necessarily; it may take on new forms, but it still seems to be an ever present need whether it be an ideology, religious denomination, or a pick-up basketball team comprised of middle aged men. Or are you talking about more cohesive and intimate clicks among males rather than an adherence focused more on the ideal that is further reaching and profound than minor tightly knit groups (that is, if there can even be a difference drawn between the two)?
i think i'm talking more about B rather than A. but i also think it's a little dependent on the individual in question moving to a state (emotionally and mentally as well) where strict divisions into subgroups are no longer seen as that important, and where belonging to a strictly defined group or tribe doesn't give the same reward that it once did. i have a feeling that when people are young strict definitions and separations of "us against them" are pretty integral to building both a sense of self and of confidence and self-esteem. i feel this is especially true in our overriding mono culture, primarily because it has gotten to be so big that it has stopped providing these functions and leaves people looking for other avenues to fulfill the need for a "in-group" or tribe to belong to.
i think most cultures inherently provide for this part of human psychology, and if not it will still end up expressing itself, like every other fundamental aspect of culture (dance, music, language, dress, etc).