The simplest answer is, "it depends." Children need to have some readiness skills in place. Is the child reading? Can he or she write letters on a line? How long can the child focus attention on one activity? Does the child want to take lessons? Has the child shown an interest on the piano at home? We can start lessons at age 6, and sometimes waiting until seven or eight ensures the child has already developed skills that ease early success at the keyboard. Before that age, I recommend that children take class lessons that focus on a variety of music-related skills that engage the child in gross motor activity, singing simple songs and playing hand-held percussion instruments. Park districts often offer such classes.