As KMT says, we are not app review and they have the final word. But my take on it is that such account specific functionality would be the case if the personal info in question was *necessary* to access the user's data. For example if you're writing an account management app, requiring the user's phone number or other account number would be OK if it's the only unique identifier of the account. You could require an email address if that's what your back end *requires* it as a user ID (but only if the functionality of the app is related to that specific email address).But in your case, where you want to use the age and gender just to provide more relevant search results, my opinion is that use case would require that info to be optional.
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Developer Tools & Services
SubTopic:
Xcode
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