Here's BI on the dependency ratios for China, Korea and Japan.
Here's the chart:
And here's what happened in Korea and Japan when the demographic horse turned:
Something to keep in mind.
UPDATE: Had to download the charts from BI because it turns out the fuckers made hotlinking to their hosted pics forbidden. I find that to be quite ironic, considering all Business Insider did was take screenshots from a Morgan Stanley presentation.
Seriously, fuckers: if you're going to post stolen data on your news site, allow hotlinking to said stolen data. Otherwise you're being fucking pricks.
Or at least change the filenames from "screenshot[...].png" and photoshop out the Morgan Stanley name from the bottom left corner.