I found myself thinking about it after middle school mostly, but it was always in the back of my mind.
My first real experience was when I was at my dad's place. I had a brother who was an extremely heavy sleeper and thus wet the bed every night. I took a pair of his training pants while the rest of my family was out somewhere else.
It was a truly heavenly feeling having them on and I was never caught the few times that I did it. Now however, my bro outgrew bedwetting, and I'm happyfor him, but I miss the chances that I once had that no longer exist.