Re: should there be an age for black belts?
Maturity is ranked way up there for something like a black belt. Leadership qualities run a close second. Technique is important, of course; but true Aikido goes beyond technique, my take on the 'beyond technique' is that Aikido is simply more than technique. Some farm kids are out there driving tractors and fixing them even at a tender age, but a regular driving license sticks with a uniform age. Maybe a bad analogy; maybe not. In gassho.