N.Y. Penal Law § 263.25: Proof of age of 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.