Yoann Doignon holds a PhD in population geography from the Aix-Marseille University, France. He is Researcher with the French National Centre for Scientific Research (CNRS), affiliated with the UMR 6266 IDEES (Rouen, France). He is too an Associated Researcher at the Center for Demographic Research (UCLouvain, Belgium) and at the UMR 7363 SAGE (Strasbourg, France). He has been a collaborator of the Mediterranean Demographic Observatory (DemoMed) for several years. He specialises in Mediterranean populations. His PhD focused on territorial and spatial convergence of the ageing population in the Mediterranean. Additionally, he has been studying population decline in France and Southern Europe, and on spatial diffusion processes of demographic phenomena, especially family changes in Europe and fertility decline. Isabelle Blöss-Widmer holds a PhD in demography from University Paris I – Panthéon Sorbonne. She is Associate Professor at Aix-MarseilleUniversity, and a researcher at the UMR 7064 MESOPOLHIS. She is the head of the Mediterranean Demographic Observatory at the Maison Méditerranéenne des Sciences de l’Homme. Her current research is mainly on the demography of Mediterranean countries, in particular, the causes and consequences of demographic ageing examined at different administrative scales of the territories. Elena Ambrosetti holds a PhD in demography from the Institut d’Etudes Politiques, Paris, France. She is Associate Professor of Demography at the Faculty of Economics and affiliated to the Department of Methods and Models for Economics, Territory and Finance – Sapienza University of Rome, Italy. Since October 2022 she is research fellow of Mesopolhis, Aix-Marseille University, Sciences Po Aix & National Centre for Scientific Research (France). She is member of the Mediterranean Demographic Observatory (DemoMed). She has extensively worked on the demography of the Mediterranean countries with special attention to the demographic transition in Egypt and in Northern African countries and to population ageing and its consequences in Italy and in the Southern European Mediterranean countries. Additionally, she is an expert on international migration, with particular focus on migrants’ integration, migration policies and demographic behaviour of migrant populations. Sébastien Oliveau holds a PhD in geography from University Paris I, France (2004) and a Habilitation from Aix-Marseille University (2011). He is the director of the Large Research Infrastructure PROGEDO and researcher at Mesopolhis, Mediterranean centre in Sociology, political science and history, France (UMR 7064, CNRS). As Assistant Professor at Aix-Marseille University, he has supervised several PhDs since 2010. His research focuses on the spatial analysis of populations. He is currently working in the Observatoire démographique de la Méditerranée (DemoMed).