I started having them at about 40 due to some complaints while still on active duty. I, of course, got one upon retirement from the USAF. Doc followed up a couple of years later - all of mine were clean.
I just had another this past year (I'm 59) and it, too was clean. So I am truly blessed. Not checking and dying of colon cancer would be a very stupid way to die! Pay attention to your bodily functions (a little man joke there! ) and get tested at least once around 50 or earlier if there is a family history!!