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Background: With numbers of very old adults (85+ years) expected to increase, and very old adults often being excluded from research and clinical trials, further knowledge about depressive disorders, antidepressant treatment and mortality among this demographic is of pressing importance.

Aims: To investigate the impact of depressive disorders and antidepressant treatment on 2-year mortality among very old adults and to explore any differences between men and women.

Method: This cross-sectional study used data from the Umeå 85+/ Gerontological Regional Database home visit interviews. The data were collected between 2000 and 2017. The total sample consisted of 2551 participants, of whom 918 had a depressive disorder. Logistic and Cox regression models were used to explore factors associated with depressive disorders and time to death. Mortality rates were illustrated and analysed using Kaplan–Meier curves and log-rank tests.

Results: Having a depressive disorder both with and without antidepressant treatment was associated with increased risk of death within 2 years for both men and women. No survival differences were found between responders and non-responders to treatment. Depressive disorders were significant predictors of 2-year mortality in men. Antidepressant treatment was not independently associated with mortality.

Conclusion: Depressive disorders are significantly associated with increased 2-year mortality among very old adults, especially men, and measures to reduce mortality are urgently needed. Further exploration of the effects of antidepressant treatment among very old adults is warranted.