If he only owes $15,000 (and that includes penalties) and the child is 8 or 9, he was NOT charged back to her birth. Perhaps he was charged from the point he turned 18.
Oh well, that's okay then. And it sets up a good incentive for people who are going to statutorily rape someone: you should delay, as long as you can, raping the child you want to rape. That way, they'll be 18 sooner and then you an send them a nice 18th birthday present -- their first garnisheed wage!
Who could object, really? The median age for the children being statutorily raped will become higher! That's an outcome nearly everyone can agree is a good compromise if you're going to ignore statutory rape and hold adults responsible for being raped as children.