Original: Most possessors of child pornography who are arrested are found to possess images of prepubescent children; possessors of pornographic images of post-puberty minors are less likely to be prosecuted, even though those images also fall within the statutes.
Simplified: Most people who own child pornography who are arrested are found to own images of children who have not started puberty; owners of pornographic images of post-puberty minors are less likely to be prosecuted, even though those images also fall within the laws.