5 - my parents never put the responsibilities of an adult onto myself as a young child.
My oldest brother bore the heaviest weight in this regard and was the least equipped of the siblings to deal with it. He's a high-functioning alcoholic and has been so for over a decade. I believe that's the mechanism he found most useful to cope with the stress my mother put on his shoulders. In his case it wasn't just WT stuff, but my mom added to that by burdening him with all of her marital problems with my father who was rarely home because of his work.
In my case, I remember being in second grade, having a crush on a girl and thinking "I can't go out with her. She's not a Witness. And besides, it's not like we'll be able to get married any time soon." Those aren't the normal thoughts of an 8 year old. Those are the thoughts of a child who has been trained to live and think like an adult from an early age.
I don't remember ever really being an adolescent. By the time I was 13 I thought of myself as an adult, had adult responsibilities, and behaved like one. It's not a normal, healthy way to grow up.