Percentage of Chinese workers who have no pension, private or public: Eighty percent (kind of puts our social security dilemmas in context, no?)
Expected ratio of workers to retirees, circa 2030: Two-to-one
Projected shortfall of the Chinese national pension system by 2033: $53.3 billion
Those are all reasons why China may be an overvalued economy; see Business Week, 31 January, p.47 for more information.
Addendum: Daniel Drezner offers his India fact of the day.