Hi , I have worked in China for a Singapore Company for since 1994.

You are a teacher or work as a techincal personnel?
If you are a teacher or so, the age limit is 65 years old. For other jobs, the age limit is still 60 years. You need to first renew your work permit and then use it, your valid passport, an application form with a recent taken photo, Valid Registration Form of Temporary Residence for Visitors to apply a resident permit in China and then extend it with similar documents.