GDPR is about being in control of your data, it’s not about being against storing information. If and only if there is a valid reason to process a birth date (because your forum has content that requires age verification), then you for sure can just do it. But you need to be open about it and have a valid reason. Processing it is just as much of an issue as storing it. And if you store it, you need to be clear about how long this data is stored and for what this information is used in your privacy statement.
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