| Summary: | Since 1945, Belgium has moved from a "rural exodus" model to the opposite model of peri-urbanization, in a context of automobile development, access to private property and an overall rise in the standard of living. This process dissociates the workplace from the place of residence and is part of the process of urban loosening that has been in use since the 19th century with the creation of the suburbs.This process is intensifying and spreading spatially in the current context of increasing internal migration linked mainly to the multiplication of modes of cohabitation and the increasing instability of family and professional trajectories. Many studies have highlighted the collective and environmental costs of peri-urbanization, and more rarely its social and demographic impacts.The aim of this article is to analyze the migratory components that feed the Brussels peri-urban area, to measure its socio-demographic effects and to understand why the process persists and grows in binding political and economic contexts.This study is based on the coupling of individual (but anonymous) data from the National Register covering the 1991-2017 observation period with those from the 1991, 2001 and 2011 population censuses.To measure the impact of migrations on the ageing of the population, we will use the method of decomposition of the average age of a population into five terms: the first is the ageing of the population without any natural or migratory movement; the second represents the effect of natural movement without any migratory movement; the third globalizes the impact of internal migrations in the absence of natural movement and international migrations; the fourth is the effect of international migrations in the absence of natural movement and internal migrations; the fifth is a residual measure of the impact of the interaction between natural and migratory movements.
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