Livers from deceased donors compose nearly 30% of all organ transplants, and about 700 liver transplants are carried out per year. Marginal livers (extended-criteria donors), however, are not usually accepted by recipient teams, and there is only one center for these procedures in Iran. The final decision is made according to criteria that are much more conservative than other globally accepted ones.To find significant differences and construct an algorithm to predict the future of marginal livers (before transfer of donors to our organ procurement unit), successfully donated and unsuccessfully donated livers divided into 2 age groups were compared in terms of age, sex, body mass index, liver function tests, significant medical disorders, and preretrieval liver sonography report.In the first age group (50-59 years old), there were 88 successful donors and 27 unsuccessful cases (due to 3 reasons: positive virology tests, death before retrieval, and ruled out by surgeons in the operating room). In the second age group (? 60 years old), there were 45 successful donors and 11 unsuccessful cases. The results showed that there were no differences between successful and unsuccessful cases regarding age and liver sonography results; however, sex, body mass index, liver function tests, and previous medical disorder were different between groups. Donors in both age groups were mostly male (60% and 73%); however, surprisingly, most unsuccessful cases were female (56.6% and 57%). Donors had generally lower body mass index (2 numerical difference), better liver function tests, and less risk factors (heart disease, diabetes mellitus, fatty liver, and chronic alcohol consumption).Before transfer of marginal liver donors to the organ procurement unit for further evaluation and organ retrieval, one must consider that age is just a number and the presence of other comorbidities can have more decisive roles on liver quality.