Having an outdated photo on your Aadhaar card might cause some issues during DU admissions, but it's not a dealbreaker. While the DU CSAS (Common Seat Allocation System) form requires Aadhaar details, you can potentially use your school ID instead, or explain the situation to the admissions officials.
While an outdated Aadhaar photo is not ideal, it shouldn't prevent you from applying to DU. Use your school ID as an alternative, If possible, update your Aadhaar photo as soon as you can.
Good luck..
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