In the Netherlands, euthanasia for minors of 12 years or older is possible. Minors between 12 and 15 need parental consent while for 16 and 17 year-olds even that consent is not required. Those in favour of the proposed Belgian law see the age of 12 as an arbitrary number. They argue that it is not about the age, but whether or not a child is able to form his/her own judgement. If that child is 8 instead of 12 and he asks for euthanasia and all the requirements are met, the age shouldn't be a factor.
I agree with those in favour.