Quantrade Journal of Complex Systems in Social Sciences invites original research papers for its forthcoming Special Issue addressing the demographic challenge and its territorial implications. The Special Issue particularly welcomes comparative, interdisciplinary and field-based studies focusing on depopulation, ageing, territorial inequalities, rural and regional development, territorial regeneration, social and technological innovation, GeoAI and GIS applications, governance strategies, and policies aimed at strengthening territorial resilience and attractiveness. The Special Issue is coordinated by an international team of Guest Editors from University of Foggia (Italy), Kastamonu University (Türkiye), University of Granada (Spain), Northumbria University (UK), and Mato Grosso do Sul State University, (Brazil) Submission Deadline: 15 November 2026 Special Issue Publication: February 2027 Detailed information on the scope, topics of interest, Guest Editors, submission process and timeline can be accessed through the Special Issue section in the menu on the right-hand side of the journal homepage.