LOL. If the median age is 50 then there are 650 million under the age of 50. If over half of those are 18 - 50 there are 400 million available for “work”. Another 250 million or so in the 50-65 age bracket that could work too. Like I said China is a bottomless pit of labor.
The cost of Chines labor is up 4x in the last 20 years. That’s not the hallmark of a bottomless supply.