First colonoscopy at 62 yrs old - worried!?

My husband is 62 years old and has never had a colonoscopy. He has a physical every year and has done the stool test a couple of times in the past 5 years and everything was fine. His diet could be better and he is slighly over weight. He does not have any symptoms - no cramping, bleeding, etc. A while back he had a brief time of having loose bowel and told his doctor. It's not a problem any more. I started reading up about colonoscopies and am shocked that most people have them starting at age 50. His doctor never suggested one until this last appointment. Do I have reason to be worried? Could there be polyps that have now turned into cancer that may have been caught earlier? If he did have colon cancer would there be some symptoms?