All of the older players I know left... and every coil group I have been in that had voice com was full of teenagers - except once (and that was a fantastic run).

Honestly, I think that the lack of diverse content and the caustic community has driven many mature players away- or to only group with people they know. The lack of accountability and overemphasis on gear score type mechanics is a big turn off for my RL friends. (All EQ players, all over 30)