Introduction: Identification of remains recovered at advanced stages of decomposition can be problematic due to the lack of physical evidence. Nonetheless, human dentition is least susceptible to decomposition and as such carry a significant value in personal identification of decomposed remains. Demirjian’s method of age estimation was developed specifically for children with developing dentition. In this article, a method on adapting the Demirjian’s method for Malay ethnic-specific age estimation using the third molar development is presented. Methods: Orthopantomograms of Malay subjects aged 18 to 25 were obtained from UiTM Sungai Buloh. Total of 318 samples were taken, comprising of 123 and 195 images from male and female subjects. Development of right and left mandibular third molar was classified according to the eight stages of development as illustrated in Demirjian’s method. Data obtained were subjected to statistical analysis such as descriptive statistics and analysis of variance. The intra- and inter-gender variation between left and right mandibular third molar was evaluated using independent student t-test and analysis of variance, respectively. Results: Intra-gender comparison analysis revealed a significant difference in the female and male with a p-value of 0.000 and 0.003, respectively. Regression equation to estimate age based on third molar development were formulated according to dental age and maturity score. Conclusion: The Demirjian’s method was successfully adapted for age estimation of individuals of Malay ethnicity. These findings can help with victim identification in cases of poor skeletal framework recovery and highly decomposed remains.