I have noticed that most styles have a two month testing cycle. So, in most 9 or 10 belt systems, one can earn a black belt in about 2 and a half years. Once kids get there that are under the age of 16, are usually held under the 3rd degree level. In the two organizations that I have been a member of, this has been the case. I think that these kids may have the technical ability to be considered a black belt, but mentally, they are not so well prepared. A black belt should be able to handle teaching duties and other such responsibilities. Most kids cannot. Most of the times they see the color, but don't really understand what it means, deep down. The other problem I see with black belt children is that they think there is no more to learn and get bored and burned out.