I got my first relaxer when I was 14, partly due to manageability issues -- my mom thought it was time I start doing my hair myself, and I decided the easiest thing to do would be to relax it. But I also must admit that part of it was to fit in with my friends -- we were only three black girls in my grade and we all had relaxed hair.
I'm 25 now. At this time in my life, I probably remain relaxed due to the fact that I can't be bothered to transition, and because I can't even imagine what I would look like fully natural, therefore I end up sticking to what I'm used to.
I love both natural and relaxed hair though.