I was batized at 25yo. I was a catholic before. What make me change? well... the WT does have its good points, firstly it does expose the lies of the other religions, e.g. Trinity, Hell fire, Eternal Soul, but then only replaces them with other lies, which by the way the WTS does a better job of hiding them from the R&F then the catholics have done. The lies of the WTS are things like. Jesus coming in 1914, and them being the FDS, and of course all the mind control that they claim is Bible based.
I beleive that most people like me get batized because they are happy to hear the truths that the WTS tell you about the bible at the begining, but they push batiztism. They convince you that all others are telling you lies and not to listen to those who disagree with them. Of course once your batized its all done under the threat of disfellowshipping, you've being 'encouraged' to change your friends because they don't love Jehovah and are therefore under Satans' control, thereby giving Disfellowshiping maximum effects. I could go on but i'll leave it up to others now.
regards Rick