Am I too old for an Ed.D?
In education, the students tend to be slightly "older" because they are required to have practical teaching experience in the classroom. One school I worked at required master level education students to have at least one year in the classroom. Another school I worked at required 3 years of teaching experience before acceptance into the PhD program. This automatically pushes the youngest Ed phds into at best the early thirties. 

Brilliance is not enough in education you also need the wisdom of experience in order to guide the next generation of teachers who will be of mixed-ability. Your background and wide experience would be attractive to liberal arts colleges. EdD is usually a practitioner degree involving, as you can guess, practical skills for K12 teaching and leadership. PhD is much more theoretical in nature and preparatory for conducting research.