You can update your costumer's Address, Gender, DoB, Father Name online in Digital India Portal Portal. For other details updates such as Demographic details (Name, Address, DoB, Gender, Mobile Number, Email) as well as Biometrics (Finger Prints, Iris & Photograph) in Aadhaar customer's will have to visit Enrolment Center.
As per the updates from the UIDAI, over 5 documents are being considered valid for proof of identity in Aadhaar card. The UIDAI accepts 5 documents for date of birth and 9 documents for Proof of Address (PoA). Full list is here: