The general recommendation for colonoscopy frequency is as follows:

• For people at average risk of colorectal cancer, start regular colonoscopy screenings at age 45 to 50 and repeat every 10 years if no abnormalities are found.
• If polyps are found or if you have specific risk factors, the frequency may be increased to every 5 years or more often.
• People with a family history of colorectal cancer, inflammatory bowel disease, or previous high-risk polyps may need to start screening earlier and have colonoscopies more frequently (every 1 to 5 years depending on risk).
• After age 75 to 80, some doctors may recommend stopping routine colonoscopies depending on overall health.

These intervals can vary based on individual health status, family history, and findings from prior colonoscopies, so it is best to consult a healthcare provider for personalized recommendations.