18-19 is legally an adult. So no, by legal definition they are not the same as as those who go after underage people. See this shit right here is why the words pedophilia and pedophile will go the same way as racist and sexist. Stop watering down the meaning of words to suit your damned agenda.
An older adult going after someone much younger than them can be a cause of concern, and might be a sign of a manipulator.
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