This crisis has been lurking for years, but it is rarely discussed. Overshadowed by unemployment, growth, or inflation rates, the demographic crisis is a growing threat to world economies. This is particularly true in the European Union, Australia, Canada, Japan, or South Korea. More than ever, active young populations are needed in order to sustain growth, be it today or tomorrow. In this context, many major powers are competing among themselves to bring in young international talents. Is immigration the key to finding a solution to the demographic crisis?