Going back to the 1960`s I attended a few congregations in Melbourne OZ,and in each of those Congs,their was only a few young children and no teenagers.
We moved to Qld OZ where over the years their were a lot of teenagers as well as young children in the various congs, we attended there.
From what i hear on the grapevine about half to 2/3rds of the teenagers have left the borg and pursued a life outside of JW. one I believe has made a name for himself as a cage fighter ?
Though some have never quite shaken off the control the religion has had of a hold on them even though they live a life that would get them DF if the Elders knew of their lifestyle.