I have been asked many times, how early can my child start piano lessons. The answer actually lies not in the child’s age, but in the child’s ability to focus on the lesson and ability to practice. If the child is not able to concentrate on a lesson and practice appropriately for their age, they will not succeed, they will get frustrated and the overall experience will not be as positive as it might be if one waited until they are ready.
A good instructor will evaluate a child’s readiness to take lessons prior to starting out. I have taught children as young as four years old, and have recommended others wait until they are seven. It is important that the child wants to learn piano, has the ability to focus for 20 minutes on one topic, and (maybe with the aid of parents) is able to practice throughout the week.