The perception of manipulable objects involves the activation of motor information in the absence of real action (i.e. affordance perception). Recent findings indicate that perceiving an object evoking distinct grasp-to-move and grasp-to-use gestures induces a processing cost. The present study aims to assess the development of this conflict cost. As it is assumed to result from the combination of general affordance sensitivity and conflict monitoring abilities, the conflict cost should follow a non-linear development. Nighty-four participants (from 8 to adulthood) performed 3D object perception tasks, an action priming task and a Simon task to assess the conflict cost induced by the evocation of distinct affordances, affordance sensitivity and conflict monitoring, respectively. Results showed that the conflict cost follows a non-linear development and evolves jointly with general affordance sensitivity. The contribution of conflict monitoring abilities requires further investigations. Findings highlight novel refinements in the development of perception-action interactions.