I ran against a guy like that in HS - he looked like he was 30 and had probably been shaving since he was 8 ... really.
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I ran against another guy in HS, who seemed to be incredible. Long story short, the guy wasn't very bright and had been put back 3 different times. He couldn't run his Sr. year because there was a rule that you couldn't be 21 and still compete in HS! ;-)