| Authors | Middle Age |
| NDOYE [19] | 71 years |
| K.TENGUE [10] | 68.5 years |
| GUEYE [9] | 69 years |
| ACHEGRI [18] | 68 years |
| HELFRICH [20] | 70 years |
| BOCCON-G [21] | 63.8 years |
| OUR STUDY | 68.9 years |