A 12-year-old can be a model. There are several modeling agencies in states such as New York, California, Florida, Maryland and Pennsylvania that represent child models.
To get a 12-year-old child involved in modeling, a parent must submit photos of the child to a modeling agency that represents children. Reputable agencies do not ask parents to pay any fees for their child to have representation, and the agency contacts the parents if it wishes to represent the child. Modeling agencies that accept 12-year-old children include Product Model Management and Wilhelmina, though there are many agencies around the United States that represent children.