Background: With increasing age body functions including the hormones begin to decline in people. Various literatures have different opinions whether serum TSH level reflecting thyroid function shows a variation in aged population or not.

Aim: The study was done to find out any correlation between age and serum TSH level in young and middle–aged population of Dibrugarh town, Assam.

Materials and method:  A population based study was done during the period of one year which included 304 apparently healthy women from Dibrugarh town. The sera from the blood collected were subjected to TSH estimation in RIA centre with Immunoradiometricassay kit

Results and observation: There was no significant correlation between age and TSH level in the study population but the TSH levels showed in increasing trend with increasing age and there were more cases of hypothyroidism than hyperthyroidism.

Conclusion: Thyroid functions seem to decline in elderly individuals. So regular screenings may be pursued to reduce the morbidity due to thyroid diseases.