Accelerated aging test, seed storability and seed size relationships on 20 peanut cv. Tatu seed lots have been analyzed. The seed lots used (10 of 20"/64 screen and 10 of 22"/64 screen) had been maintained under open storage conditions. At the beggining and after every two months, seed moisture content, vigor and standard germination were obtained throughout the experiment (about 14 months). Accelerated aging test was performed under 48, 72, 96, 120 and 144 hours, at 43oC ± 0,5 and 100% relative humidity. Standard germination values showed significant decreases throughout the experiment; however, the 10 month-storage period presented slight increases in germination percentages. Seed size had no effect on seed vigor and storability; however, 20 size seed lots showed better correlation among accelerated aging test and seed storability than 22 size seed lots. Additionally, regression analysis showed that initial seed vigor after 48, 72, 120 and 144 hour-accelerated aging was significantly correlated with those of standard germination after 2-10, 12, 4 and 6-8-14 month-storage periods respectively. From these results, regresssion equations, able to predict seed lot storability accurately, were developed.