The thing is it is not up to elders (or at least it isn't the law everywhere) to report a crime such as child molestation to the authorities unless they have personally been a witness to it, or have been specifically asked to do so by the victim and/or parents who will then have to accompany them. It is up to the victim or victim and/or parents. They are the ones who have to do the reporting.
This is incorrect. Almost all states have mandated child abuse reporting laws that apply to certain professionals such as teachers, doctors, nurses, etc. A majority of these laws apply to clergy, although not in every state. They require reporting upon reasonable suspicion of child abuse or neglect, not proof. Its not up to the victim or parents. The parent could be the abuser.