Is it discriminatory for employers to recruit only high school students in this city?

According to the relevant information, the query display does not count. According to the law, if the employer takes nationality, race, sex, religion and other congenital factors as recruitment restrictions, it is regarded as employment discrimination. Employers only recruit high school students in this city and do not discriminate against migrant workers. Maybe they just want to provide a good working condition for local high school students.