New York Laws
Article 263 - Sexual Performance by a Child
263.25 - Proof of Age of Child.

Whenever it becomes necessary for the purposes of this article to
determine whether a child who participated in a sexual performance was
under an age specified in this article, the court or jury may make such
determination by any of the following: personal inspection of the child;
inspection of a photograph or motion picture which constituted the
sexual performance; oral testimony by a witness to the sexual
performance as to the age of the child based upon the child's
appearance; expert medical testimony based upon the appearance of the
child in the sexual performance; and any other method authorized by any
applicable provision of law or by the rules of evidence at common law.

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