Technical Abstract: We investigated the effects of maternal age on fitness of progeny in the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae). Five-, 20-, and 50-day-old female rice weevils were used to investigate the effects of maternal age on the life-time fecundity and longevity of their daughters. In addition, we looked at the effects of maternal age on the weight and survivorship of daughters’ progeny. Daughters of 5- and 20-day-old weevils lived longer and the numbers and weights of the progeny of these daughters were higher than for daughters of 50-day-old weevils. Survivorship of immature grand-offspring of 5-day-old weevils was higher than for immature grand-offspring of 50-day-old weevils. None of the fitness characteristics of the daughters and grand-offspring of 5- and 20-day-old weevils that were measured differed significantly. We believe maternal age effects on rice weevil progeny fitness may be acting through maternal age effect on egg size. Individuals that developed from larger eggs produced by 5- and 20-day-old weevils had a greater fitness than those produced by 50-day-old females. The greater fitness of rice weevils developing from larger eggs compared to that of those developing from smaller eggs may mean that egg size variation in rice weevils is adaptive. In addition, the greater fitness of offspring of younger weevils compared to that of older weevils may have influence on the evolution of aging. Our paper also discusses the possible adaptive significance of age-related egg size plasticity in rice weevils and its implications for population modeling.