This article is devoted to problems facing pension systems Republic of Moldova and the world, caused by aging, decreasing fertility rates, life expectancy, migration processes, etc.. These demographic changes are seen as a threat to financial sustainability of pension systems, especially when the current global economic crisis has increased financial pressures. Moldova is not an exception to these trends, are perhaps more affected by data transformations. Article is an analysis of demographic challenges on how they affect the pension system, and how the pension systems can be adapted to the socio-demographic changes.