Age estimation is important in identification of living individual, forensic and archeological studies.We conducted a study to assess cavity formation of head of femur as one of the best determining factor for age estimation.Method: Volunteers of > 21 year with defined inclusion and exclusion criteria , radiographed and evaluated in parameters of cavity formation by SPSS system.Results: 276/300 participants were imaging and evaluated.significant linear trend of distribution of cavity formation with increasing age from Non recognizable cavities in column(69.57% ) and trochanter  major with loosings(30.43%), is significantly better predictor (x²=352.8; P < 0.0001) in young of 21–30yr  while in > 70 years Clearly recognizable cavity  in trochanter major (51.22%) and large cavities in column (21.95%).Conclusion: The cavity formation varies with age and good determinate only in extremes of age that is in the beginning of formation and at resolution of it.