How to set restrictions for individual Apple TV accounts?

I have set up apple tv and myself and my children have accounts. I cannot seem to restrict their accounts to individual age restrictions. I have set up the restrictions as directed using the passkey, however, all accounts then change to these restrictions including mine. I have also logged into their accounts online to set up parental controls, however, this has still made no difference to their apple tv accounts. How do I rectify this? I do not want them to access tv content above their ages.

[Re-Titled by Moderator]