Most industrial countries today are facing serious problems regarding old age security. Based on the idea of the working young taking care and providing for the retired elderly by contributing taxes to a pay-as-you-go redistributive pension system, the traditional contract between the generations has been put at risk due to an increasing life expectancy combined with decreasing birth rates. The demographic problems Western societies are facing today will worsen tomorrow jeopardizing the financial stability of a pay-as-you-go pension system. The main questions of this book referre to the financial stability of a such a pension system, the joint redistributive character of immigration and pension and the voting outcome on immigration policy. In order to arrive at answers to this questions, various economic literature is analyzed occupied with the topic of migration and pension under different aspects of the issue.