Based on what your saying then it seems to me that it should be based on the individual and not the age. My point was that I am not certain that many 6,7 or 8 year olds have the mature level to hold a black belt! I am just saying the same holds true for students who have to pay respect to the "black belts" it seems to me it is the same. Black belts are the seniors in the school and who all other students do in fact follow, or so I thought.
I guess it comes down to definitions of mature & black belt. To me a kid is a kid. We are all born as baby infants, then grow to be older "kids" or children. Then we are no longer a child when we enter the teen years (13 = thirTEEN) & become a TEENager. However some may still say they are still "kids"
So I like the concept of Gen Choi's junior black belt which is exactly half white & half black. According to his 6 belt color scheme, white among other concepts, signifies innocence. Black, the opposite of white on the color scheme signifies maturity, among other concepts.
So mixing the 2 colors to me is the perfect mix & helps solve this problem. It allows the recognition of the skill acquired, that they are no longer a beginner & have grasped the physical basic techniques. While it also symbolizes the obvious lack of maturity!
This problem is addressed by not only making the junior black belt to wear this special junior belt of half white & half black until they become at teen at the age of thirteen (13), but by limiting them to 1st degree until they are 14.5 years old. The clock that requires at least 1.5 years to go from I Dan to II Dan does not start till they are 13. A further ITF restriction was added by Gen Choi that the age of 9 is needed for 1st degree.
So little Mary gets her 1st degree at 9, but wheres the junior black belt till she turns 13. She can not be a 2nd degree till she turns at least 14.5 at the earliest. So when people see Sissy Mary crying at 9 as she is afraid to sleep in the dark, or beginning taken to the dojang by the hand, not even allowed to cross the steet or go to a public bathroom by herself, they won't be confused when they she that yes she is a black belt, but a junior black belt, as she like all kids lack maturity, along with some adults we all know. Obviously the younger you go the more clear the points are.
I also like the Kukki TKD Poom system, named & created by Dr Kim from examples of the Korean civil service system.
The point is that each entity must have a logical way to handle this inherent conflict