Objective of the study. To determine the structural differences of aponeuroses in different age groups of patients with postoperative ventral hernias. Materials and methods. Comparative orphological studies of aponeuroses of 36 patients operated in the First and the Second hospitals Samarkand State Medical Institute for postoperative ventral hernias aged 40 to 76 years. Patients are divided into 3 groups according to the WHO age classification: Group I included patients 45-59 years old; Group II 60-74 years old; and the Group III in-cluded patients 75-90 years old. The biopsy specimens of the anterior abdominal wall, obtained during hernio-plasty were subjected to histological examination. Standard pieces of aponeurotic abdominal wall tissues taken during surgery were fixed in a 10% formalin solution on phosphate buffered saline for light microscopy exami-nations. Paraffin sections were stained with hematoxylin and eosin (H&E). Results. Investigation of biopsy specimens of aponeuroses and adjacent muscle tissue in patients of different age groups have revealed signifi-cant structural differences that can determine the frequency of hernias of the anterior abdominal wall and their recurrences. Conclusions. The study discovered that with advancing age significant structural changes occur on the aponeurosis of abdominal rectal muscles. The nature of these changes, especially the disruption of the collagen fiber arrangements, suggests that these structural changes are responsible for the weakening of the aponeurosis.