Not sure what the flags are about in here, but here's an outsider's take on the question under discussion: The question about identifying age markers in general seems to be perfectly legitimate. Whether or not it's *actually* on-topic for Biology.SE is an exercise left to "native residents" of that site. However, the child pornography elements really are not needed to support the question. And they're obviously causing more controversy than their worth.
I say, keep the question but nuke the child porn bits. And then let Biology.SE regulars decide whether it's properly on-topic.