I'm 58, I've had two sigmoidoscopy which are the short versions, but my new Dr convinced me that sigmoids were not enough. In and out on Friday, about 2 hrs for entire process. Colonoscopy was about 30 min. Instead of fully conscious and uncomfortable as with a sigmoid, I had an iv and was sedated, pain and discomfort free... except for prep, drink a gallon of laxative day before and spend 3 or so hours camped on the pot with a good book. What ever sedative they used, it was wonderful. I woke up feeling very comfortable and at ease as compared to the last time I had surgery (in the 70s) nauseous, like I was gonna puke. As far as results, do you really want to know? If so keep reading. Mild to severe diverticulosis, several aphthous ulcers (of the colon vs mouth), and no colon polyps. Ulcers were biopsied although I don't think they are associated with cancer like polyps can be. Anyway the Dr did not seem concerned and they will call me in a few days with results. As far as I know the age were you start getting these exams are 50, earlier if you have any family history.