 The title of the presentation is Age Estimation Based on CT Test Analysis or Ausification of this Efficient Joint in Living Population aged 35 to 50 years. The aims and objectives are to find out the reference age group where there is complete Ausification of this Efficient Joint in men and women and to find out whether the Ausification of this Efficient Joint can be used for age estimation in the age group of 35 to 50 years. Identification is necessary in various medical legal scenarios like determining the age of criminal responsibility, statutory rape, victim trial by juvenile or adult court, and identification of victims in the case of decomposed inmates. Age is a vital baseline parameter in both civil and criminal cases. The legal age of consent, retirement age, concessions for senior citizens, and age of marriage are some of the important applications of age determination. Age identification can be done by legal or scientific methods. Legal methods include documents like birth certificate, school mark sheets, voter IDs, etc. However, they are not universal and are falsifiable. Scientific methods include physical, dental, radiological, and forensic examination. Legal methods have an advantage of being non-invasive and can be applied in living as well as dead substance. Efficient has better contrast and by virtue of its 3D reconstruction, it can be used for studying skeletal structure accurately and in high detail. This Efficient Joint starts to fuse in the third decade and is fused completely by the fourth or fifth decade. This is an observational study designed with a sample size of 384 patients. The inclusion criteria are any patient of Indian origin in the age group of 35 to 50 years who are registered in our institute and are undergoing CT scan of the chest for any indication and those who are willing to participate in this study. The exclusion criteria are history of trauma to the sternum, pathological lesion in the sternum, or systemic bone diseases like osteoporosis, tri-planar and three-dimensional elevations of this Efficient Joint were done on the CT console using 3D CT volume entering technique, maximum intensity projection, and multi-planar reconstruction projections with proper medical settings. According to Canaria et al., the fusion of this Efficient Joint can be graded as grade 1 for new fusion, grade 2 for partial fusion, and grade 3 for complete fusion. Figure 1 shows AC and E are endropocytic abuse, B, D, and F are posterior oblique use. A and B shows non-fused Efficient Joint, E and D shows partly fused Joint, whereas E and F shows complete fusion of the Efficient Joint. The study population was divided according to the gender and age ranging from 35 to 50 years as shown in Figure 2. This is a pie chart distribution, subjects by the fusion status of the Efficient Joint. 33% of the subjects had unfused Efficient Joint, whereas 58% shows complete fusion of the Joint. And partial fusion was seen only in 9% of the population. Figure 4 is a chart showing comparison between percentage of completely fused joint in men and women by their age. About 100% of the female participants and 96.6% of the male participants took complete fusion of the Efficient Joint by the age of 50. For the same age, there was no significant effect of gender on the fusion status of the joint. The mean age of complete fusion of the joint was found to be 46.3 plus or minus 3 women and 45.5 plus or minus 4 years for women. Age after which 95% of the participants show complete fusion is 37 years. On the contrary, the age after which the joint remains unfused in only 5% of the population. The p-value for all the correlation is less than 0.001, which is significant. Our results are distinct from the previous radiological studies based on both radiographs and CT scans, which suggests the difference in the ethnicity of the population, which needs to be considered in radical legal scenarios. Technical parameters such as the slight thickness of the CT scan can also affect the image resolution and thus influence the estimation of the age of complete ossification. Further, the intrinsic characteristics of the population sample can also affect the mean age. The application of foreign standards for the estimation of biological attributes in human skeletons results in reduced accuracy. Certain limitations to a study were that the lower age limit was 35 years, at which some participants already showed complete fusion of this effusion of joint. Thus, inclusion of each participant in the study sample would affect the overall mean age. It is also affected by extreme values and in our cases, there is a predominance of values at the extremes of ages. The socio-economic and nutritional changes of the participants was not taken into consideration. Thus, the CT assessment of ossification of the deficient joint is useful in age estimation. The mean age at which the complete fusion of the joint occurs in men and women is 45 to 46 years. The chronological age of the individual can be estimated to be greater than or equal to 37 years when the deficient joint shows complete fusion. Similarly, in the case of unossified deficient joint, the age of the individual can be estimated as lesser than or equal to 45 years. There is no significant difference in the age above which men and women show complete ossification of this deficient joint.