I'm sure it's with parents consent. I have a large family of 18 cousins ad 37 second cousins and many are under 16, lots of them have thee hair coloured. In the school holidays my cousins daughter comes for bright pink put in her fringe, she's 8, and has it done with crazy colours, that way it washes off and it's not going to cause damage. She and my cousin love it.
When it comes down to it, these kids, if banned from having professionals colouring their hair, will find a way of getting a box colour and will in te end cause more damage and possibly have reactions, which can be prevented by us doing skin tests strand tests and knowing what we are doing. If anything I'd say ban box colours to under 16's.
In that light though, from 11 I was colouring my hair, sometimes natural sometimes all over wild colours like green or blue m, so it's nothing new happening, ad it won't end by saying no.
So I think us as professionals should take these kids under our wing and do their colours, make them look good, give them a confidence boost and aid their development as an individual person not a sheep xoxo