Abstract: Speech is an extensively overlearned oromotor behaviour that becomes more automatised over the years due to the storage of their motor routines. To determine when this storage occurs in development, the EEG/ERP spatiotemporal dynamics underlying speech-motor planning were investigated in three groups: children, adolescents and adults. The production of speech was contrasted to sounded non-speech gestures that use the same effectors as speech but are not as frequently trained. Non-speech motor codes are assumed to be individually planned on the go, instead of being stored as motor routines. Neural results revealed a gradual differentiation between speech and non-speech motor planning with age: while ERPs did not differ in children, adolescents and adults showed gradually increasing differences in amplitudes and in topographies between speech and non-speech. This suggest that the speech motor code storage is not completely established yet in 7–9-year-old children but later during development, in early adolescence.