I don't really see a common denominator with IBS and who gets it. Being on these boards the last few years I've seen people from all walks of life, different ages, and from all different areas around the world! For me I was born and raised in California. Now living in Nevada. I'll be 25 next month, and besides my IBS I have had my gallbladder out last year. And also have ovarian cysts. Besides that I consider myself healthy. It does seem to run in the family for me though, I have several relatives with the same problem.