Cell phones for children

This article says that cell phones are a tumor risk to young children. I know there has been debate on whether or not cell phones are a health risk. There's a possibility they're not. But there's also a very good possibility they are. Apparently they are thought to cause tumors on the nerve leading from the the ear to the brain. They're not cancerous tumors. But who wants any kind of a tumor! This article suggests that you not allow children age 8 and under to use a cell phone, and that you use "parental discretion" for children 8-14. My question is, that if cell phones cause tumors in children, don't they also cause tumors in adults? What is special about the makeup of a child (compared to an adult) that would cause them to be prone to tumors (apart from their small size making a tumor of any size more important to treat)?