Peter Attia is speaking my language here:

In my practice, we typically encourage average-risk individuals to get a colonoscopy by age 40, but even sooner if anything suggests they may be at higher risk. This includes a family or personal history of colorectal cancer, a personal history of inflammatory bowel disease, and hereditary syndromes such as Lynch syndrome and familial adenomatous polyposis.

I was diagnosed in 2017 during a colonoscopy (age 35 at the time). It was stage IV by the time it was seen, in my case the disease was in the sigmoid colon. Even with the...