How old does it take to be a medical worker?

There is no age requirement.

The conditions for health workers to apply for the exam are: they have been engaged in this occupation or related occupation 1 year or more (inclusive), have completed their apprenticeship in this occupation or related occupation, have a junior college degree or above, and have been engaged in this occupation or related occupation for more than 2 years (inclusive) after obtaining the vocational qualification certificate (skill level certificate) of Grade IV/Intermediate Workers in this occupation or related occupation.

A health care technician is a person who uses basic medical care knowledge and skills to provide health care and life care for customers in families, hospitals, communities and other places.