Truly a Church-approved answer.  Make up an unreasonable law (age of consent 30 years) and use that for justifying no action against priests who prey upon children.  The law is so unclear and varied, so secular law offers no guidance and the Church has been unable to discern any restrictions in the Bible, nor has the Holy Spirit led them to any restrictions.  So, at the risk of being unfair to the clergy, it is best to continue doing what has always been done.