I developed IBS after giving birth to my first son (2 years ago) when I was 19. I have to agree with Kiwii though, I used to hold it in when I was in school and I was a cheerleader so we had practice everyday after school until 5. I am kind of grateful that my symptoms did not appear until after high-school because I was very active. I just wish we could find a way to make it go away completely!