Somewhere around 13, I think it started with desire to go back to being a bedwetter. Then one day I saw a commercial for Goodnites and I knew I had to have them. I think I managed to buy a pack within a month or so and from the moment I put the first one on I knew I was hooked. Before that I...
For me, as others have said, nostalgia. They were the first ones I ever tried. This was also when they were all white and larger than they are now. Its also their design. Goodnites use the elastic on the sides while adult pull-ups use it at the top and sides.
OK, I totally didn't catch this till now, but on my visitor messages there is the one where you wrote mu eulogy, then right above it is you asking if I am still alive :P