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Background: Age is a strong risk factor for increasing the risk of severity and death from Covid-19. The risk of hospitalization for Covid-19 disease increases with age. Since the elderly constitute a large proportion of Covid-19 patients, the present study was performed to evaluate the severity of the disease in the hospitalized elderly due to Covid-19 and the delay in hospitalization and death resulting from it, for better disease management. Methods: The present retrospective cohort study was performed on 444 elderly patients with Covid-19 admitted from 1 April until late October 2020 in Baharloo Hospital in Tehran, Iran. After being diagnosed using the results of RT-PCR and CT scan, patients, were divided into 3 groups: moderate, severe and very severe based on the severity of the disease. Analysis of variance was used to compare quantitative data and a chi-square test was used to examine qualitative variables in disease groups. Results: From 444 elderly participants in the study, 73% were infected moderately, 15% severely, and 12% had a very severe form. The mean age was 72.90±8.42 and patients with a very severe form of the disease (75.68±8.28) were older. The average time from the onset of symptoms to hospitalization was 7 days. In the elderly with a very severe form of the disease, respiratory dyspnea (P=0.002) and decreased level of consciousness (P