Objective– To study the age of fusion in sternal end of the costal cartilage of the first rib with manubrium as seen with naked eyes. Methods– The present study has been conducted in the Department of Anatomy in collaboration with the Department of Forensic Medicine, Pt. B.D. Sharma PGIMS, Rohtak. For the study, the specimen comprised of 50 pairs of first rib along with manubrium in both sexes in the age ranging from 15–30 years, collected from the cases of medico–legal autopsies done in Department of Forensic Medicine after taking proper consent from the legal heir of the deceased and were then cleaned and observed with naked eyes. Results– To study the age of fusion of first costal cartilage with manubrium, the specimen were observed with naked eyes and were classified in the following categories– non fusion, beginning of fusion, active fusion, complete fusion. The mean age of non–fusion was 17.1 years in females and 16.2 years in males. The mean age of active fusion was 22.1 years in males and 23 years in females. The mean age of complete fusion was 27.4 years in males and 27.6 years in females. Conclusion–The fusion of first costal cartilage with manubrium proceeds faster in males as compared to females.