One of the justifications provided for early retirement policies in developed countries is the idea that such policies can facilitate access to the labor market for younger people and help lower global unemployment. But many questions remain on the true effect on young workers of these policies. The objective of the present paper is to study the long term relationship between labor force participation of the old and unemployment of the young in France since the beginning of the 1970s. Establishing causal relationship of the reduction of labor force participation of the old on employment prospect of the young is a challenging work. Evidence of the correlation between youth labor market outcomes and older worker's labor force participation pl...