Fergie, the John Jay Institutes report on Catholic clerical abuse is the most detailed so far.

It states that in the general population the overwhelming number of victims are female.....In clerical sexual abuse, four out of five victims are male.
2 out of 5 of these young male victims are over 15 years of age. 2 out of 5 are between 11 and 15.

That means that half of the victims are over 15 and under 18.