I'm five years younger than you, but I can relate to the experience of your youth. I was raised "in" by inactive parents who nevertheless expected that I follow all the rules even if they couldn't explain basic doctrine to me. I wanted nothing more than to become an adult so I could move out of my oppressive household.
Then a weird thing happened. My oldest brother who'd shouldered more of a psychological load than he could bear from my mother who used him as a shoulder to cry on started becoming really active. Before I knew it he got baptized in high school and then fell under the wing of an overzealous elder in his 20s. This guy pushed my brother hard and he became a regular pioneer after graduation and a few months later he was shipping off to Bethel.
It all happened so fast that I couldn't really process everything. But our no-name household all of a sudden became a buzz of activity as people from all over the circuit flocked to shake the hand of this anomaly, this kid who'd been raised by inactive parents who somehow rose to the rank of Bethelite. He became something of a rock star and looking back on things, I think on a deep, emotional level I kind of wanted to get in on the action even though I would have never consciously admitted it to myself.
I was always a curious kid and had learned enough of science to understand at a basic level that Genesis was nonsense. One day when I was 15 I picked up the old blue Creation book and within a few days I was a changed person. All of a sudden I wanted nothing more than to "serve Jehovah." The book had convinced me that (a) there had to be a God, (b) science didn't contradict the Bible and (c) the JWs had it as close to right as any other religion.
I graduated a year early to become a regular pioneer and was on the same path as my brother. I was young, naive, and completely full of myself. At 16 I had figured out all of life's great mysteries. Isaac Newton had spent a lifetime trying to understand the mysteries of the bible and here I was having it all figured out in my teens!
Thankfully I fell for a beautiful JW girl when I was 18, fondled her boobs, went to the back room, and started on a road to decline that eventually would lead me to wake up in my early 20s. I haven't been to meetings since 2005.
The JWs were manipulative, but I wanted to be manipulated. I was a fat, brainly, unpopular kid in his freshman year in high school and by the time I was 17 I was something of a star in my own little world (kind of like my brother was).
I don't know that there's any remedy for that. It seems to me it's an ingrained weakness in mankind and there will always be people who devise ways of exploiting it.
The internet helps. I didn't have it either when my "conversion" happened. Now kids are used to searching all over the web and discussing any and all subjects on reddit. It'll be increasingly harder to manipulate youth, but I don't see it coming to an end either.