Olympic rules stipulate that every competitor must be at least 16 years old in the year of the Olympics, which means they must be at least 15 years, eight months now. How many of the Chinese look like they're old enough for a learner's permit?
This image from Sports Illustrated really shows the contrasts. Look at the hips on the two teams.
The biggest question at this point seems to be whether He is 13 or 14.