When did Sarah Polley become known as a child actor?
Sarah Polley: Sarah Ellen Polley {'1': ", '2': ", '3': ", '4': "} (born January 8, 1979) is a Canadian actress, writer, director and political activist. Child actor: The term child actor or child actress is generally applied to a child acting on stage or in motion pictures or television, but also to an adult who began his or her acting career as a child; to avoid confusion, the latter is also called a "former child actor". Child actor:  Closely associated is teenage actor or teen actor, an actor who reached popularity as a teenager.
who reached popularity as a teenager.