Dave de Vos
I didn't know there existed such a thing as a junior black belt. AFAIK in the Netherlands there is a minimum age of 16 for black belt in judo. I tried to look up what it is in aikido and I found minimum ages varying from 16 to 18. So juniors are not tested for black belt in the Netherlands from what I can find.
It's just a rank that we award locally. Junior ranks are not registered with our national organization.