When should a male get a colonoscopy?

50 years old, unless. Regardless of gender, people without high risk factors are advised to begin screening colonoscopy at age 50, repeating at 10 year intervals if nothing is found. Those with high risk factors such as first degree family history of colorectal cancer or polyps should begin at age 40.
50+. The general screening guideline is starting at age 50, men or women. Family history of colon cancer can push that time table up. Certain medical conditions like ulcerative colitis also requires earlier surveillance for colon cancer.