Consider that some young people have yet to reach working age, too.
I saw many young people from elsewhere being hawkers without licenses in the northern parts of sz, self employed without records are unemployed by offcial definition.
It is not hard to be employed for the young people in mainland china if they can accept low salary. Employers highly preferred young than old for jobs not requring university degrees. Fewer middle age and old waiters and security staff than you see in hk.
The Chinese government should take lessons from the UK government of the 1980s on how to 'reduce' the number of youths appearing in the unemployment figures.
In the US we decided to reduce our numbers by deciding that if you are no longer looking for work (as in, it's totally hopeless and there are no jobs) then you are not "unemployed" because we can only count those actively seeking work! You would be amazed how many people you can stop counting this way...
At work in the UK in the 1980s I had 9 large excel spreadsheets that fed into the master production scheduling spreadsheet. Then at the bottom of that sheet were hidden lines called "seasonally adjusted due to school leavers" in honour of government manipulation of data where I could put in what I wanted the data to say before it was fed into the mainframe to spew out purchasing demands.