while i agree that its wrong to have little black belts i think 16 is a fair age. Providing the student is of an excellent standard. How ever i have met exceptions, name ly a 15 years old 2nd dan who was amazing (just a normal kid, no parents in karate). when he turned 16 he had to do his first dan grading again whichw as a shame. I think the key is not allowing the students own instructors to grade them, but rather an outside panel