I did my own math from the limited data, and concluded that if there is no family history of colon cancer, the risk of a complication (such as puncture) from a colonoscopy roughly equals the likelihood that something serious will be found (at best).
So no thanks, at least for me. Others can do their own calculations.
My father had benign colon polyps removed twice. He died of lung cancer...smoker. My youngest son, a smoker, was diagnosed with cancerous polyps in 2019 at the age of 49. Had two re-sections, removal of over 70 lymph nodes, and 6 months of chemo. Two other members of my family died of lung cancer..smokers too. Oldest sister a smoker, died of a stroke at 74. My only brother, a smoker, died of a massive heart attack at 51. No history of colon cancer though.
I never smoked. Have been getting colonoscopies since I was 50. Was previously diagnosed with diverticulitis, and in 2010, despite following my diet religiously, my bowel perforated, and I ended up with a colostomy for three months, after which it was reversed. Last year, my gastroenterologist found a benign small polyp during the colonoscopy. I turned 75 this year, and consider myself lucky to have lived longer than anyone else in my immediate family, but I have my own health issues, most of which no one else in my family was ever diagnosed with.