16 years old can work, 18 years old is a minor worker.
There is no specified age for health certificate processing, which means that it can be processed at the employment age, which means that it can be processed at the employment age of 16 or above. You need to go to the local prevention and control department or the hospital above dimethyl.
According to the Labor Law of People's Republic of China (PRC).
Article 58 The State applies special labor protection to female workers and underage workers. Juvenile workers refer to workers who have reached the age of 16 but not 18. Article 64 underage workers shall not be arranged to engage in underground, toxic and harmful labor with the fourth level of physical labor intensity stipulated by the state and other jobs that are forbidden.
Article 65 The employing unit shall conduct regular health check-ups for underage workers.