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You would never be able to close an illegally opened underage account. Paypal permanently limit it and stop you removing anything connected to it in case you try and open another one against their rules.
HOWEVER as you are now 18 and they have said you can open a new one then go ahead and open one BUT you would need to contact customer services and ask them to remove any linked cards or bank accounts from the limited account IF they are able to and agree.
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