But you have to understand some people don't train to make it "big" (other than the late 20's people who walk into your gym). I know when I first started training it was purely for self-defense. I got into a lot of fights in high school and I was a small kid in 9th grade, only about 5'7 - 130 lbs, (I am now 5'11 - 170 lbs). After training for a while I really got into it though and started wanting to fight as an ameteur, which indeed never happened, reason why mentioned in the above post.
making it big or not its still not late to train =P
and you gotta have the dreams goin and chase after it if you really wanted to fight haha.
im doin just that already and under age =P