I can confirm the fact that CP uses that 18+ or graduated method because my sisters friend Paul worked as the the head of the Raptor crew in 97' I believe (may have been 98), right after he graduated high school. He went to stay with his aunt for the summer in Ohio before starting college the next fall, and I asked him a few questions about his experiences there when he got back. I enquired how old you had to be to be a ride-op there, and he said that they asked if he was older than 18 when he applied for the ride-op job, and when he said no (he graduated at 17, about 2 months before his 18th birthday), they asked if he had graduated high school yet. He explained that he was turning 18 soon, and he said that he had graduated high school, and he got the job.
~Joe
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Ride 'Till you drop