1) Apply for non availability certificate of birth
with the office of birth and death registrar
2) on basis of non availability certificate apply to judicial magistrate for registration of your birth
3) you woukd need evidence of your date of birth
4) affidavit of parents that you were born on said date
5) Do you have hospital discharge reports ?
6) You may need said report for issuance of birth certificate after lapse of 40 years
7) you would also need school leaving certificate, voter I’d card .