There are a few things you can do to change the age of your child on Google Family Link. First, you can choose to have your child’s age set to 13. This will make it easier for parents to find information about their children and keep track of their development. Second, you can choose to have your child’s age set to 18. This will make it easier for parents to find information about their children and keep track of their development. Third, you can choose not to have your child’s age set at all. This will let you manage your child’s growth as they please.