The article of the Economics (April 26, 2014) titled “Demography, growth and inequality; Age invaders” ends up with the following passages:
It (shift to ageing population) will be a world in which ageing reinforces the changes in income distribution that new technology has brought with it: the skilled old earn more, the less-skilled of all ages are squeezed. The less-educated and jobless young will be particularly poorly served, never building up the skills to enable them to become productive older workers. Compared with the dire warning about bankrupting consequences of a gray tsunami, this is good news. But not as good as all that.
I think “Gray tsunami” means global and quantum increase of the aged population, and find it an interesting wording.
But is “Gray tsunami” an acknowledgeable set of words to describe accelerating ageing of global population to the point, or just a one-off coinage invented for this article?