Even 737/A320 Captains are not guaranteed a job. China is that great hoover of pilots in the flying universe who, in principal, would offer jobs to any pilots who are current captains on these types. The problem is that the people who are desperate to employ you are the very same people who will go out of their way to kick you out with crazy medical requirements just to get rid of foreigners. Therefore pilots of 50+ who are exactly who the Chinese want will not darken the door of the place because they know that after a year they will be thrown out for failing a medical or some crazy sim check over some bizarre issue that no other nation in the world would care about. It is such a shame as many pilots would love to spend a few years there, but dare not because it is a mad house. Very strange indeed!