None, however, need the assistance of adults in their group for nearly a quarter of a century. This is the span of time Montessori identified as necessary for complete adult formation in the human being. Her conclusion is supported by recent scientific research demonstrating that the foundational neural structures in the frontal lobes of the human brain are not completed until approximately age twenty-four. It is in the frontal lobes that our most advanced reasoning and knowledge reside, including wisdom.
