以老年人为消费主体而形成的产业silver industry; industry focused on elderly consumers

• 很早以前就有人提倡开发“银色产业”，至今却没有形成规模。

  People started advocating the development of "silver industries" long ago, but as of yet they have not developed to any scale.

• 在国外，老龄产业被称为“银色产业”。

  Abroad, industries for the elderly are called "silver industries"