I think they did have a class for teens and children around the 1940s or sometime back then. Maybe someone knows more about this. I could be wrong. Since then, they stick to the "one size fits all" idea. I remember hearing brothers from the platform saying that we have the necessary "spiritual food" at the meetings for all ages. They discourage parents from having their little kids nap, have toys or color during the meetings. They pretty much expect them to sit down quietly and listen the whole time and then go on to critizise other Christian religions for providing child care services and seperate schools.
It would be nice to provide something for children. All I remember about meetings as a child was daydreaming and not paying attention the majority of times. And maybe occasionally given the task or writing down bible texts and tally the number of times the name Jehovah and Jesus came up at the meetings.