Quite a few major countries are going to struggle though. The US may have a bigger Millennial cohort, but if we say Gen Xers are 42-55 and Millennials are 26-41, the population pyramids for many large economies make for grim reading. Consider Italy (adjust ages for being 4 years ago): https://commons.wikimedia.org/wiki/File:Italy_population_pyr... .. or, to a lesser extent, China: https://commons.wikimedia.org/wiki/File:China_population_pyr...
Quite a few major countries are going to struggle though. The US may have a bigger Millennial cohort, but if we say Gen Xers are 42-55 and Millennials are 26-41, the population pyramids for many large economies make for grim reading. Consider Italy (adjust ages for being 4 years ago): https://commons.wikimedia.org/wiki/File:Italy_population_pyr... .. or, to a lesser extent, China: https://commons.wikimedia.org/wiki/File:China_population_pyr...