How old is the three-star service security guard of the property?

18-50 years old. Three-star service security guard of the property, the recruitment age should be between 18-50 years old, and must be specially trained and have more than one year working experience. The word "property" was translated from English property or estate, and was introduced into coastal areas and inland areas from China and Hongkong. It means property, assets, real estate, real estate, industry and so on.