<prompt> Translate the following text to EnglishKwa sababu ya kupungua kwa kiwango cha kuzaliwa na uhamiaji mdogo, inakabiliwa na kupungua kwa idadi ya watu wenye umri wa kufanya kazi kwa angalau miongo kadhaa ijayo wakati wastaafu wanaongezeka.  <response>: Thanks to a declining birth rate and negligible immigration, it faces a steady decline in its working-age population for at least the next several decades while retirees increase. 