I think bein a black belt at a young age is a very bad idea. I have been in Karate for 4 years and im right in the middle of the ranking system. Being a black belt may meen you kno the technique and basic style but when you are young you arent ready mentally or physically to compete with that level of belt in a tournament. Dojos that produce black belts at the ages up to 16 seem like they are only after the money and to please the parents with progress. Being blackbelt at a raw age gives you false ideas about how good you really are in a real fight or in a tournament. It makes them cocky also they are not able to have the maturity it takes to be a black belt. Also they think they can whoop anyone and when they get whooped then they will not go or the parents will blame the sensei.