Hello,
To change your DOB in APAAR ID, you first update your Aadhaar card, once Aadhaar card is corrected and updated then APAAR ID will automatically updates the information.
To know more access step by step process to change DOB in APAAR ID from mentioned link below:
https://school.careers360.com/articles/how-to-apply-for-changes-in-apaar-id
Hope it helps.
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