Actually,before its opening,the Baidu Index showed that people who were interested in TF4 were mainly aged between 30-40. To them,transformers means memories of childhood.
Monkey King and Dad, two crap movies with poor WOM are now sweeping Chinese movie market, and claiming records.....LOL, this is the ture reality of China's movie industry.
It seems we have a good certain number of people who are loyal to Hollywood movies. They saw MOS, and saw Thor 2, and will certainly go to see Gravity... That's why those movies always finish the same in B.O. numbers ($50M-$60M). While movies like IM3 and PR are also welcomed by other non-Hollywood fans, and they finished in higher numbers.