Silver Book Fact
The incidence rate for colorectal cancer is more than 50 times higher in people ages 60-79 than in those under 40.
American Cancer Society. Colorectal Cancer Facts & Figures, Special Edition 2005. Atlanta, GA: American Cancer Society; 2005. http://www.cancer.org/acs/groups/content/@nho/documents/document/caff2005cr4pwsecuredpdf.pdf