To register marriage there are some mandatory conditions:
The both Bride and Groom must be present in the marriage registration office with 2-2 witnesses from each side.
The age scale of Groom is 21 and 18 of Bride is compulsory.
One of them partners must be a citizen of India.
The address proof of both Bride and Groom will be attach with the application.
Registration of the marriage should be done in 60 days after the last ceremony.
Penalty will be charged for registration if the period of marriage is over 60 days.
Read more: https://www.delhi-lawyers.com/marriage-registration-in-delhi