What documents will serve as proof of date of birth in case of individual applicants?
Copy of any of the following document will serve as proof of date of birth in case of individual applicants being Indian citizens (including those located outside India) :

Birth Certificate issued by the Municipal Authority or any office authorized to issue Birth and Death Certificate by the Registrar of Birth and Death or the Indian Consulate as defined in clause (d) of sub-section (1) of ​ section 2 of the Citizenship Act, 1955 (57 of 1955); or
Pension payment order; or
​Marriage certificate issued by Registrar of Marriages; or
Matriculation Certificate; or
Passport; or
Driving License; or
Domicile Certificate issued by the Government; or
Affidavit sworn before a magistrate stating the date of birth​