This novel experiment investigates the relationship between readers’ eye movements and their use of “noisy channel” inferences when reading implausible sentences, and how this might be affected by cognitive aging. Young (18–26 years) and older (65–87 years) adult participants read sentences which were either plausible or implausible. Crucially, readers could assign a plausible interpretation to the implausible sentences by inferring that a preposition (i.e., to) had been unintentionally omitted or included. Our results reveal that readers’ fixation locations within such sentences are associated with the likelihood of them inferring the presence or absence of this critical preposition to reach a plausible interpretation. Moreover, our older adults were more likely to make these noisy-channel inferences than the younger adults, potentially because their poorer visual processing and greater linguistic experience promote such inference-making. We propose that the present findings provide novel experimental evidence for a perceptual contribution to noisy-channel inference-making during reading.