Aims: It is known that the angle between the aorta and the septum on the long axis in two-dimensional echocardiography is different between individuals in the community. The relationship between aortoseptal angle (AoSA), age and diastolic dysfunction has been mentioned in a couple of articles. We aimed to investigate if this angle is directly related to duration of hypertension (HT), regardless of age factor. Method: The data of 1294 patients who applied to the cardiology outpatient clinic and whose AoSAs were recorded and analyzed retrospectively. SPSS 20 was entered and the correlation of AoSA with age, duration of HT and other data was investigated. Results: A significant correlation was found between AoSA, duration of HT, age, and diameter of the ascending aorta. A partial correlation was sought for when age was taken under control, and then a significant correlation was found between AoSA, duration of HT and diameter of the ascending aorta. Conclusion: Aorta is known to lengthen depending on age and duration of HT. This elongation shows that the aortic root, the free end of the aorta, is progressing towards the ventricle. This situation narrows the angle between the septum and aorta. As a result, one can have an idea about how long patients have hypertension by looking at the narrowing in AoSA.