What about just plain old starting lessons at age 5 or 6 with the piano teacher lady who lived up the street?
Exactly. I've just voted but found I could only tick the bottom two boxes. Any of the stuff listed that one might have learned, I would have learned at music class in school, not as part of piano lessons.
I had 4 piano teachers. In chronological order they were my mother (who had had some musical training but not in performance or in teaching) started me off when I was 5, but there was only so far she could take me. From age 9 I had my first "proper" piano teacher, Maria the daughter of the "mystery Catalan composer" and violinist I mentioned some weeks ago, Joan Massià, and of his wife the pianist Maria Carbonell; she came to our home, at first twice a week, and within a year she had me giving my first "public recital" as part of a pupils' concert organised by her mother. When we moved to Canada (Edmonton) I had lessons, from age 12, with a guy called Robert Pounder who taught at the local music academy (not the aptest of surnames for a pianist). Finally from age 15 I was at boarding school in Germany where I had lessons with Franz Alfons Wolpert, who was also the general music teacher at the school, and was also a composer and musicologist. I have had no piano lessons at all since leaving high school.
An interesting fact about Wolpert is that he had developed a method for chord classification because he did not think much of the one by Hindemith. Wolpert's system recognises only 15 different types of chord (or 18 if one counts two-note "chords"). I might expand a bit on this method in a new thread.
I'm intrigued by the statement that there is a (and by implication only one) correct tonal method for writing chromatic scales. What is it? Is it the one which minimises the number of accidentals necessary, taking the prevailing key signature into account? What if one is temporarily in a key which is not reflected in a change of key signature?