Can I Employ Someone with below Age 18?

For employment of young person aged 15 or above but under 18, you are advised to refer to the specific regulation on young person especially if your business is related to industrial sector, to see if you met the regulatory requirements on young person.

Reference - A Concise Guide to the Employment of Young Persons (Industry) Regulation: http://www.labour.gov.hk/eng/public/lid/ConciseGuideEmploymentYoungPersonsIndustryRegulations.pdf