Final answer:
Non-modifiable risk factors for colorectal cancer include older age, family history, specific genetic mutations, and African ancestry. These factors cannot be changed through lifestyle or behavior, unlike modifiable risk factors such as diet, exercise, and smoking.
Step-by-step explanation:
Non-modifiable risk factors for colorectal cancer are those that individuals have no control over and cannot change through lifestyle or behavior. These include older age, a family history of colorectal cancer, and certain genetic factors such as inherited gene mutations. African ancestry has also been identified as a non-modifiable risk factor. While environmental and lifestyle factors such as diet, physical activity, and smoking play a significant role in the likelihood of developing colorectal cancer, there are some risks that cannot be avoided, including certain inherited genes like BRCA1 and BRCA2, which are more commonly associated with breast and ovarian cancer but can also increase colorectal cancer risk. It's important for individuals to be aware of their non-modifiable risk factors as they can inform monitoring and prevention strategies.