I have a strong interest in the physiology, anatomy and psychology of healthy, efficient physical use in all contexts, which in turn is a huge part of my approach to playing and teaching piano. Over the years I've studied and/or completed formal training in Embodied Anatomy, Alexander technique, yoga/mindfulness, Feldenkreis, Gyrotonics, and Rolfing. So I'm no stranger to the field of injury prevention, but even I was struck dumb (no small feat) by the following excerpts from an online forum for young pianists. These are verbatim, promise."The most intriguing one...seems to be some type of recurring stress fracture in my right index finger...but most consider my technique flawless"
Not to put too fine a point to it...yes, it is possible to start piano lessons too young and, yes, there is an entire industry out there devoted to convincing you there is a critical developmental period which you must pounce upon before it is ALL. OVER. Call me cynical, but the earlier this purported deadline falls the longer the marketable window over the life of your kid.