I have a dream: The study of human development would make an epistemic leap due to the fact that “true” interdisciplinarity was reigning supreme and impacting the research landscape. The article argues for why that would be the case and suggests ways to make progress towards the realization of this dream. Five promoters of “true” interdisciplinarity are suggested: (1) work and management structures of research institutions; (2) structures of research funding including the reviewing process and the willingness to take some risks; (3) openness of peer-review journals and their review process; (4) academic education preparing for true interdisciplinarity; and (5) availability of multilevel cohort-sequential panel studies around the world covering the whole life span.