比喻老龄人口快速增长的社会现象silver tide; increase in the elderly population

• “银色浪潮”已悄悄地向地球人口积聚的发展中国家袭来。

  The "silver tide" is already silently attacking the developing countries of the world that have an accumulation of population.

• 进入20世纪90年代以后，“银色浪潮”的提法开始出现。

  After the 1990s, the formulation "silver tide" began to appear.