There have been some really interesting studies which showed that in order to get colorectal cancer you have to accumulate 4-6 deletrious mutations in the same

There have been some really interesting studies which showed that in order to get colorectal cancer you have to accumulate 4-6 deletrious mutations in the same cells. People with genetic predispositions are born with 2-3 of those mutations. That's why we see this age association. (Just remember being fascinated and thought I would add some context.)