For most adults, colonoscopy is recommended every 10 years starting at age 45–50 if you are at average risk and your last exam was normal.

Basic schedule by risk level

  • Average risk, normal colonoscopy
    • Start around age 45–50, then repeat every 10 years if no polyps or cancer are found.
  • Family history of colorectal cancer or polyps
    • Often start earlier (about age 40 or 10 years before the youngest affected relative) and repeat every 5 years or so, depending on findings and your doctor’s advice.
  • Inflammatory bowel disease (ulcerative colitis, Crohn’s in the colon)
    • Surveillance can be every 1–5 years depending on how long you’ve had disease and how extensive it is.
  • Prior polyps or colon cancer
    • Follow‑up may be every 3–5 years or even sooner, based on the size, number, and type of polyps or cancer stage.

Always follow the interval your own gastroenterologist writes on your report; that overrides general schedules.

Age limits and when to stop

  • Many guidelines suggest reconsidering screening after about age 75–80; beyond that, the risks of colonoscopy can outweigh benefits for some people.
  • After about age 85, routine colonoscopy screening is rarely recommended unless there is a very specific reason.

This is individualized, so age, other illnesses, and overall life expectancy all factor into the decision.

Why the interval changes

  • If your colon is clean and no polyps are found, cancer usually takes many years to develop, which is why a 10‑year gap is considered safe for average‑risk people.
  • If polyps, inflammatory bowel disease, or strong family history are present, the chance of new abnormal growths is higher, so the interval is shortened to catch problems earlier.

Think of the interval as a “risk dial”: more risk means more frequent checks.

Quick reality check (2020s–2025)

  • Screening is starting earlier (age 45) in many places because colorectal cancer in younger adults has been rising over the past decade.
  • There is ongoing discussion in medical journals about whether some people can safely extend beyond 10 years after several completely normal colonoscopies, but this is not yet a universal standard.

If you’re unsure where you fit (average vs higher risk), the safest next step is to ask your doctor: your age, family history, and last colonoscopy report are the key pieces they will use to set your personal schedule.

Bottom line: if you’re 45 or older and have never had a colonoscopy, or it has been around 10 years since your last normal one, it is usually time to ask about scheduling.

Information gathered from public forums or data available on the internet and portrayed here.