Final answer:
The high incidence of colorectal cancer is primarily seen in elderly individuals due to various risk factors.
Step-by-step explanation:
The high incidence of colorectal cancer is primarily seen in elderly individuals. According to the American Cancer Society, each year approximately 140,000 Americans are diagnosed with colorectal cancer, and it is one of the most deadly malignancies. Factors such as a family history of colorectal cancer, smoking, excessive alcohol consumption, and a diet high in animal fat and protein increase the risk of developing this type of cancer.