Z visa Over-age and purpose of medical?

It seems that at as male 69 years old I am too old to fit the template requirement for a work permit, Z type.
Three questions...
1. Is there any room for negotiation on the age criteria? It does not matter to my prospective employer?
2. Is the medical merely a validation of the health questions asked on the application or are they seeking deeper health issues eg organ weaknesses: hypertension, kidney weakness.
3. would it be better if I came to China and helped my prospective employer negotiate the z type process by my personal presence. I am not a chinese speaker. Though a presentable mature male.