Ake, the National Catholic Reporter has had hundreds of articles on the subject of the abuse of children by clergy in the Catholic Church, all available at that link. Here (click) is a link to the most recent of many articles on the Regensburger Domspatzen. I believe that in a boys' choir, the boys are usually soprano, which means that they are reasonably young.
But it really doesn't matter, does it? When an over-21 adult has sex with an under-18 child, it's a crime in most civilized parts of the world.
You can access many, if not all, of the National Catholic Reporter articles on abuse under "Accountability" on their Website. The National Catholic Reporter is very critical of how the Catholic Church has mishandled the sexual abuse crisis all these year - and their position more-or-less matches mine. Here (click) is a sex-offender priest's story. It's very unsettling.

-Joe-