Purpose. The goal is to analyze endonasal surgery for chronic dacryocystitis depending on the age of the patient. Material and methods.An analysis of the results of endonasal dacryocystorhinostomy (EDCR) in 92 patients (92 eyes) operated on in 2018–2023 is presented. The age of the patients averaged 42.3±6.2 years (from 24 to 77 years). There were 69 female patients, 23 male patients. The patients were divided into 2 groups: 1st group – 29 patients under the age of 40 years, 2nd group – 63 patients who were over 40 years old at the time of surgery. The patients underwent a study of their general somatic condition, medical history, functional tests: Schirmer test, canalicular test according to the method of M.Yu. Sultanov, as well as a canalicular and nasal test with dye to determine the active patency of the lacrimal ducts. If necessary, diagnostic probing was performed. The severity of lacrimation in the postoperative period was assessed using a 4-point scale (from 0 to 4). Results.After the operation, in patients of 1st group, the absence of lacrimation (score of 0) was noted in 93.1% of cases (27 eyes), moderate lacrimation with a score of 2 – in 3.5% (1 eye) and severe lacrimation with a score of 4 – in 3.5% (1 eye). Thus, the required effect after surgery could not be achieved in 2 patients (in 7.0% of cases), who subsequently had to undergo repeat surgery. In the postoperative period of 2nd group, the absence of lacrimation (0 points) was recorded in 84.1% of cases (53 eyes), insignificant 1 point in 1.6% (1 eye), 2 points in 3.2% (2 eyes), in 3 points – in 4.8% (3 eyes) and in 4 points – in 6.3% (4 eyes). Thus, moderate and severe lacrimation was detected in 9 patients (14.3%), for which they underwent reoperation. Conclusion. Endonasal dacryocystorhinostomy is a more effective and preferable method of treating chronic dacryocystitis in patients under the age of 40 years compared to patients in an older age category. Key words: endonasal dacryocystorhinostomy, lacrimal ducts, chronic dacryocystitis, patient age