It is illegal to employ a child under 14 except under specific circumstances. Child labor laws cover any employee under 18 years of age.Once someone reaches age 18, they are considered an adult. However, employers of minors under age 18 must obtain and keep on file proof of the minor's age. In Texas, older minors—meaning 16- and 17-year-olds—may work as many hours as they'd like. (1) A child who is at least 14 years of age may apply to the Texas Workforce. Commission for a certificate of age. A concise guide for Texas employers to the pitfalls and rules regarding hiring kids. Minors under 14 may not be employed in a hazardous occupation unless otherwise specified in the state's child labor law. As used in the law, the term child means an individual under 18 years of age. Exemptions.