Exposure to formaldehyde is one of the occupational hazards experienced by medical students during their education, which has detrimental effects on the pulmonary functions. The concept of lung age was introduced to give a simplified and consolidated impression of the different spirometric parameters of an individual. An increased lung age implies a functionally older lung, underlining a premature decline in pulmonary efficiency when an exposure to a toxic substance is present. The present study was done to estimate the lung age of first year medical students over six months of exposure to formaldehyde. Computerized spirometer was used to record the lung age. Descriptive statistics and repeated measures ANOVA were applied for analysis. A p–value < 0.05 was considered statistically significant. An increased mean lung age was observed after first month, which was nearly restored to baseline values by the sixth month. Increased lung age reaffirms the adverse effects of formaldehyde on the respiratory system. However, the body adapts to it over a period of time. We need to promote steps to reduce exposure by various means like use of masks, specially–engineered ventilation systems, and prevention of unnecessary spillage of formalin in dissection hall or find an alternative embalming fluid.