I think it depends on when you come "in". I was brought up in a divided household, and really didn't take to the jw stuff, until I did it on my own at 15. I spent the next 3 or 4 years as a brainwashed dubby. A good elder friend of mine, (not an elder at the time, though), told me about 1975 when I was about 19. That is where the doubts first started. They became much stronger after I was first married at 22. It took ten years to leave at that point, (32). I have been out for over three years now.
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