Understanding the life-history characteristics of a fish species is a key component for stock assessments and should ideally be species-specific. In this study, we used length-at-age data to provide renewed life-history information for rock flathead (Platycephalus laevigatus) and used a Bayesian inference approach to present growth estimates for the species. Length- and age-at-maturity analyses revealed that male rock flathead matured at smaller lengths (L₅₀ = 32.68 cm TL) than females (L₅₀ = 35.15 cm TL), but both sexes achieve sexual maturity at similar ages (A₅₀ males = 2.17 years; A₅₀ females = 2.12 years). Furthermore, the species could potentially have accelerated growth driven by fishing-induced evolution. Bayesian growth models suggests that rock flathead may have greater growth rates (k; males = 0.52±0.05; females =0.44±0.01) than initially thought. Our results provide an important update on the biological life-history of rock flathead, offering new insights that could assist with future stock assessment and ongoing management strategies since the species' first age estimates were reported over two decades ago.