I had my first and only so far colonoscopy done six years ago, at age 61, after my M.D. suggested I have it done. Not because of the results of a stool test but mainly because I was older, had left home young and therefore I don't know any of my family's past medical history.
While I was under the doc found and removed three polyps and because he did he suggested that I have the procedure done every five years from now on as opposed to every ten if he would have found nothing.
I'm about a year overdue for having another colonoscopy but last year I had several other medical and dental issues that required surgery and although they were warranted I was just plum fed up with people messing with me so I put it on the back burner......I do plan on getting it done this year.
The actual colonoscopy itself is a piece of cake, there is absolutely no pain whatsoever during or after the procedure......although I will admit that the day before fasting and 'clean out' at home isn't a lot of fun.
Like all medical procedures there are risks......highly unlikely percentage wise but perforation of the colon or rectum wall is possible.