I was about 12. I took a friend along to a meeting and he said he didn't mind learning stuff but it was a shame it was so boring.
I was about 14. I had my very own Bible study and took him along. He just kept whispering about the girls there that he fancied.
I was in my early 20's. I took along a lady that I knew. She was astonished at the WT study. She said that she'd never heard of a religion that not only supplied the answers to everything but also supplied the right questions to ask.