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I'm sorry to hear that the system will not let you update your date of birth. If you're trying to change the information that was initially added, please reach out to customer service to request help with the update. There may be a requirement to submit documentation to make the change, but the representative can guide you in what is needed.
To find the number to call customer service or access the ability to write a message to PayPal, please click Contact at the bottom of the PayPal website, or you can reach out by PM on Facebook or DM on Twitter.
I hope this helps!