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During movement, modulation of beta power occurs over the sensorimotor areas, with a decrease just before its start (event‐related desynchronization, ERD) and a rebound after its end (event‐related synchronization, ERS). We have recently found that the depth of ERD‐to‐ERS modulation increases during practice in a reaching task and the following day decreases to baseline levels. Importantly, the magnitude of the beta modulation increase during practice is highly correlated with the retention of motor skill tested the following day. Together with other evidence, this suggests that the increase of practice‐related modulation depth may be the expression of sensorimotor cortex’s plasticity. Here, we determine whether the practice‐related increase of beta modulation depth is equally present in a group of younger and a group of older subjects during the performance of a 30‐minute block of reaching movements. We …