What is the age cut off for Teenage bodybuilding? The age limit to compete in Teenage Bodybuilding is 18 & under. For clarification this limit is 18 years & 364 days. By admin|2019-01-04T09:37:23+00:00January 4th, 2019|0 Comments Share This Story, Choose Your Platform! FacebookTwitterWhatsappPinterestEmail Leave A Comment Cancel reply Comment Save my name, email, and website in this browser for the next time I comment.