What age? Do you think state by state or by country? Examples: 1. I believe a sexual predator would be a 22 year old banging a 16 year old. That's messed up. 2. I don't believe 2 15-16 year olds dating or being active together qualifies them for this label.
By definition a "sexual predator" forces themselves on another person sexually. The age they are when they begin this behavior is the age that they become a sexual predator. Before that they were the victim of a sexual predator/abuser as that is how such persons are created.
