Hi
Your sub account can be upgraded to a Master Account only once you are 18 years of age. When you are 18 and wish to upgrade your account to a Master Account:
- A sub account can be upgraded to a master account when the sub account user becomes old enough. The sub account user needs to log in, and then select
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(Settings) > [PlayStation™Network/Account Management] > [Account Information] > [Upgrade Your Account].
(Settings) > [PlayStation™Network/Account Management] > [Account Information] > [Upgrade Your Account].