The estimation of age is a crucial process and it should be very accurate. Various methodologies are available in the estimation of person’s age in forensic odontology. The Gustafson’s morpho histologic approach is most widely used method and includes six parameters to assess age. Amino Acid Racemization (AAR) is used to know the dental age using chemical method which has been reported that the amount of D-aspartic acid accumulated in enamel and dentine increased with aging. Death stops this conversion. The average age variance of the studies included in this review using Gustafson’s method showed ±7.148 and that of AAR is ±1.3125. The variability was more in Gustafson’s method as compared to AAR. Extensive research should be incorporated for evaluation.