In the Uk we apply something called 'Gillick competence' it is about judging the understanding and maturity needed in a child to make their decision.

Each child is different obviously but instead of a one age fits all rule, it is based on level of maturity and understanding. My son is 9 but I beleieve he would be found competent if asked for his reasons why he didnt want to see his dad.

I think its disgraceful that the voice of children so often goes unheard/ignored.

ps
Ill bring the chocolates