Check my other comment I just responded to. Basically like every government China doesn’t just track “unemployment.” They track based on many different factors and sectors and age is one of them. 16-24 is a specific bracket that is often benchmarked as signs of positive growth from an economy and is linked to general upward mobility (think back to 08 in the USA when the Great Recession meant incredibly high unemployment rates, but higher rates among young people). So when those numbers aren’t favorable it paints a bleak picture that something in the economy is wrong. So rather than them actually trying to create new jobs and do better they chose to simply get rid of the numbers. The reason they most likely have a high unemployment rate among 16-24 is because those are heavy “factory” or “industrial line” years for workers who get jobs producing things. When you’re economy is contracting though and companies are building new things elsewhere then you have higher youth unemployment as a result. For the numbers check the other comment. It goes into further detail about other areas.