The forum format was more popular with older generations as a main source of online community. My son's generation (he's 19), he and his friends have never frequented forums for online community. I think that's an appeal for older ages. Not as a clear-cut rule, but overall. I've noticed this same on another large forum I used to frequent - we had teens, but only as a minority of the participants. This could be one reason the age is showing up the way it is.
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