A side note as long as we're on the topic:
I had my first one at age 50 a bit more than 5 years ago. One small polyp removed, so they told me to come back in 5 years.
My sister, a family practice doc, said that they (you know, "they") recently changed the recommendations on when to come back.
So I met with my colonoscopy doc and asked him to review my case and advise me when to come back. He said that in my case, the new recommendation is 7 to 10 years but his practice recommends 7 years.
So I will get my second one at age 57 in a bit under two years.
This may seem silly, but I strongly prefer to balance the diagnostic value of colonoscopies with the very small risk of a colon perforation.
Over the 25 years I might have to be doing colonoscopies, I figure I might avoid one colonoscopy by doing this - needing only five instead of six.
I don't mind the colonoscopies themselves, and I don't even mind the prep. But I really don't want a perforation, so one less risk exposure is better in my book as long as I'm within the guidelines.