The contribution explores the work and evolution of the COIRAG Interest Group on Developmental Age, showing how its founding premises have guided subsequent phases of activity and its internal structuring. The group has consolidated itself as a space dedicated to fostering clinical reflection in the area of development, from the formation of a parental project through late adolescence. Its articulation into sub-groups has enabled the exploration, also at an operational level, of specific phases of the life cycle, particularly the first thousand days and adolescence, with attention to parenthood. Coordination work has been a central element in maintaining cohe-sion and engagement with the task. The organizational recalibrations that have emerged over time may be understood as expressions of a dynamic adaptation to clinical and socio-healthcare complexities. The centrality of the group is thus con-firmed as a framework for thinking about and interpreting clinical experience, as well as the importance of maintaining the group’s boundaries open to interdiscipli-nary dialogue and collaboration with other associations and institutions in the field.