How fast would colon cancer grow in a 62 year old man?

Variable. It depends more on the cell type of the cancer than the person's age. Usually colon cancers grow fairly slowly, but some can have a more aggressive cell type.
Usually slowly. It is believed that colon cancers develop fairly slowly--a polyp may take 5-10 years to become cancerous. However, once a cancer develops, it can spread to other parts of the body fairly quickly.