Here's some thoughts (from AI):
Colonoscopies aren't universally recommended after age 75 because the potential for harms like bleeding and perforation increases with age, while the benefits of finding cancer may be limited by a shorter life expectancy and more health issues. While the
U.S. Preventive Services Task Force (USPSTF) found the harms of screening to be small to moderate for adults 76 and older, their guidance is to make screening decisions on an individual basis up to age 85, based on patient health and preferences.