If parent had colon cancer at 80, what is risk of offspring getting it after 65? no other known family member was diagnosed with gi tumor or condition

Cancer screening: Cancer screening is recommended and all populations over the age of 50. In your case it does not matter if a family member had cancer at the age of 80 you should have your screening at the age of 50 regardless. The only time this becomes significant is if a family member has cancer around the age of 50 in which case immediate family should be screen 10 years prior to that age.