What is the mortality rate during colonoscopies? i am 72 years old, better than average heart condition.

It is very low...: ...and somewhat dependent on the skill of the examiner/competence of the facility. About 1 in 200 people who have a colonoscopy have a serious complication: perforation of the colon (1/2000); bleeding 2.6/1000) and death (3/100,000 or 0.03%). For almost everyone, but especially if you have a personal or family history of polyps/cancer, it is worth risk. Have one: if normal, you're probably done:)