Does anyone out there know what the answer is to 'what age can an expat work until in Shanghai?'

I am a 64 year old teacher who will turn 65 this June which is just at the end of the first year of my contract. I cannot get information from anyone as to what the answer to my question actually is. All answers vary from it being impossible to probable. Even my employers do not know. I would appreciate it so much if anyone knows what the answer is or who I can contact.