Damaged Indian passport. To apply for a new passport what should be done?
It doesn't make much difference if the name, photo and passport number are still readable - see the following from the Embassy of India:
Damaged passport is classified further based on the extent of damage, i.e.:
- Damaged Passport - Passport number is readable, name is legible and photo is intact
- Damaged beyond recognition
To apply for duplicate passport in case of lost or damaged passport, you need to apply for "Re-issue" of passport.
To apply for a re-issue of a passport, like you'll need to - you follow the same steps as any person getting a new passport. PassportIndia.gov.in has the application page with instructions - note that:
If you ever held a passport in the past, no matter how much long back or at what age, you should choose the Re-Issue category only.
Having a damaged passport does not preclude you from renewing or obtaining a new one.
But because your passport expired so long ago, you might check to see if you have to go through the original documentation process again or simply follow renewal procedures.