That is the best thing about aadhar card. You can change or update the info online. All you need is a valid document in image or pdf format to support that change. You can upload that document online and voila within 7 days of verification of that request you can generate an updated aadhar card online in pdf format for print out or later use.
To do this you need to have your mobile no updated in your existing aadhar card details. If mobile no is wrong or not correct then you need to send the request via postal mail.
If you have mobile number updated( mob no is printed on aadhar card itself)
then click here to change the details.
What all aadhaar card details/information can I update online?
Date of Birth