From what I understand (please correct me if I'm wrong) one of the points of Merkel's politics when encouraging immigration was exactly this - getting a younger

From what I understand (please correct me if I'm wrong) one of the points of Merkel's politics when encouraging immigration was exactly this - getting a younger workforce in, to restore the pyramid. Now some people say "immigration bad" but I didn't see any alternate solutions for fixing the pension system. I mean, there might be, but I haven't seen them.