If you havent made it by 40,just enjoy life.A 4000 yuan job in China is a good move for a forty year old.There is nowhere to go but down at 40 but the fall can be enjoyable

An interesting point, but I am somewhat the worrier. I wouldn't feel comfortable just earning 4,000 yuan a month, or even 10,000 yuan a month at 40. I always feel each year should be better than the last, even if that means a move to somewhere different, a different job, and so on. Thanks for your reply.