I did not know this, and did not have a colonoscopy
until I had symptoms at age 46. At that time I was diagnosed with Stage IIIc colon
cancer. If I had regular testing from age 40, my cancer would have been found in a much earlier stage. Early detection is very important in colon cancer, and despite what anyone tells you, it is not necessarily an indication of poor diet. Some people have a genetic predisposition to colon cancer.