From lab to online: Replicating age-related decline in double-step reaching across the lifespan.

= 241; ages 20-79) using an online double-step reaching paradigm with mouse-cursor tracking. Linear mixed-effects models revealed robust age-related declines in ROC, characterized by longer correction latencies and more rigid corrective movements, even after accounting for device variability and general slowing. Participants increasingly relied on a speed-accuracy trade-off strategy with age, extending movement durations to preserve endpoint accuracy. While older adults' correction latency was linked to their motor imagery efficiency, unlike the previous lab study, the endpoint accuracy was not associated with motor imagery but primarily dependent on the kinematic feature of correction deviation. Moreover, response inhibition, measured by the stop-signal task, emerged as a robust predictor of correction efficiency across the lifespan. These findings confirm age-related declines in ROC under more heterogeneous, real-world conditions and show mouse-cursor tracking as a viable method for large-scale, online studies of motor control across the adult lifespan. (PsycInfo Database Record (c) 2026 APA, all rights reserved).