The aim of this study was to investigate the long-lasting effects of prolonged administration of ethanol doses on oxidative processes of aged rats. We determined the activity of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) in erythrocytes of rats 15, 20, and 24 months old treated with an average daily dose of 1.5 g/Kg of ethanol or saline administered intraperitoneally for 13 weeks and after a 2 month period of withdrawal from treatment. The activity of all three enzymes decreased significantly with aging in the controls, while no age-related changes were found among treated rats. These findings are important since they are the first to show a long-lasting toxic effect of low ethanol doses observed in association with the aging process.