9He Made His Debut At 18 

Via en.wikipedia.org

The promoter at the time while Ambrose was training was Les Thatcher, and he didn’t think Ambrose was ready for the ring. Fortunately for Ambrose, he left the promotion and Cody Hawk stepped in and gave Ambrose his shot to prove himself as a wrestler. All the persistency eventually paid

off for Ambrose and at the young and tender age of 18 he made his professional wrestling debut as Jon Moxley in AHA after only one short year of training.

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