Bill Fullington doesn’t remember exactly where he read that all adults over age 50 should be screened for colon cancer. A magazine? Maybe the local paper?
In any case, Mr. Fullington, a retired teacher in Birmingham, Ala., takes excellent care of his health; he never smoked, doesn’t drink, hits the gym daily. “Everybody thinks I’m 30 years younger than I am, because of my zip,” Mr. Fullington said in an interview. So he dutifully arranged to have a colonoscopy in 2008, when he was 80.