In the congregation that i grew up in there were about 30 children under 16 (myself included). As time went on they one by one slipped away from the meetings and most never got baptized. Of those 30 children only myself and two other girls stayed and got baptized. Of us three myself and one girl have "fell away".
So by the example 1 in 30 young ones actually stay in the organization. Wether the girl still in actually beleives it is another matter, she's married with children now so for all we know could be staying because she's comfortable. Comfort was the reason i stayed two years longer than i should have. I stopped believing it but carried on for two years because i didn't know anyone outside the JW religion.
So my old KH is full of old ones. New members that come in aren't young, they're 30yo+. I hear that this congregation is merging with another one because they very rarely fill even half the seats. My last congregation it's the same story. Only they're merging THREE congregations together.
I think it's a clear sign that the governing body have no idea how to keep young intelligent minds "in" this religion. So many rules to abide by that are unreasonable.
I was speaking to someone only yesterday about my old JW life and she was surprised that the little ones are supposed to sit there in meeting and conventions listening to the same thing as the adults. Nothing entertaining or exciting about it - even for adults.