A user is asking if their wife can use her old Aadhaar card with her maiden surname, as she has updated her name on Aadhaar to her post-marriage surname. She has exhausted the two-time limit for name changes on Aadhaar. While Aadhaar is primarily a unique number, its practical use as an identity document is widespread. There's ambiguity regarding the legal validity of using an older Aadhaar with a previous surname when name change limits have been met, with no clear instructions from UIDAI on the matter.