Ask PlayStation on Twitter: "@Ateek_H That option is not available. In this case the age of the child account is set up when you create the account but for security reasons is
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Safety for parents (US)
Can't make a realms says I have a child account but I definitely don't, this is in PS4 by the way : r/realms
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01 - PS4 - Creating your child's account on their PlayStation - YouTube