Introduction: Childbirth is often delayed in the contemporary world in view of advancing profession and social reasons. This has lead to increasing infertility. And this also has brought in many studies on age and ovarian reserves even in India. However the northeastern part of India is demographically and geographically different from the rest of India and similar to only a small part of the world population. This study was conducted to find if the above mention factors has any role in the relation of age on ovarian reserve and also with the ABO blood grouping. Material and methods: It was an observational clinical study with a duration of 3 years on patients with infertility. Descriptive and inferential statistical analysis was carried out in the present study. Result: 80% of the study population, irrespective of the age group and blood group has basal FSH < 10mIU/ml. However correlation statistics of age with bFSH shows age (in years) of 35.02±3.13 with bFSH >10mIU/ml and have p value of 0.020. Blood group O shows FSH > 10mIU/ml and blood group A,B,AB does not manifest any relation with FSH. Conclusion: Age has directly related with ovarian reserve represented by basal FSH, and blood group O too has direct correlation with impaired ovarian reserve.