Since the 1970s, the pension system in Belgium has changed with the development of mechanisms for early retirement from the labour market. This article analyzes the evolution of senior migration over the last 40 years. It also studies the possible impacts of early retirement on mobility. An initial observation is that of decreased mobility beyond 50 years between 1970 and 2006. A second change concerns residential choices. If migrants have traditionally moved primarily to large cities and rural communities, the destinations in 2001-2006 are more diversified. Finally, a link between the timing of migration and that of the departure from the labour market could be demonstrated, although it would appear that the probability of migrating before the age of 65 years is lower for those leaving the workforce earlier.