Objective: To examine the relationship between morphological characteristics of the abdominal aorta and age, sex, body height and weight by using standardized measurement of clearly defined anatomic areas of the abdominal aorta on computed tomography. We tested our hypotesis that due to different hystological morphology between the upper and the infrarenal part of the abodminal aorta. There are also age related differences in dilation between these two distinct anatomical areas of the abodminal aorta. Design: Cross-sectional study. Settings: The study was performed in Clinical Unit of Diagnostic and Interventional Radiology University Hospital of Split. Participants: The study included 46 participants older than twenty years who underwent computed tomography of the abdomen between 1 February and 30 April 2012. Main outcome measures: Diameters and lengths of the abdominal aorta in a clearly defined areas of measurements. Results: Men have larger (F=6,6; P=0,014) and wider aortas than women. The maximum infrarenal aortic diameter is wider in men than in women (F=15; P<0,001). Aortic diameter increases with age in both, men and women, but the length doesn't increse (r=0,58; P=0,704). Body mass index isn't associated with diameter and length of the abdominal aorta (r=0,05; P=0,748). We haven't found the differences in diameter changes between the visceral and infrarenal part of the abdominal aorta: the diameter of aorta at the level of the right renal artery is in participans age ≥60 years 0,45 cm wider than in participans age ≤39 years (Bonferoni; P=0,013); the diameter of aorta at the bifurcation is 0,39 cm wider in participans age ≥60 years than in participans age ≤39 years (Bonferoni; P=0,015). Conclusions: Our results show that the aobdominal aorta changes morphologicaly with age and it is wider in men. However, we didn't prove that there are age related differences in morphological changes of the abdominal aorta between the upper and infrarenal part. Further and larger studies are needed to determine this relationship.