Prohibition of employment of men under the age of twenty-five years and of women.

No person who is licensed to sell any liquor or intoxicating drug for consumption on his premises shall during the hours in which such premises are kept open for business, employ or permit to be employed either with or without remuneration any man under the age of 25 years or any women in any part of such premises in which such liquor or intoxicating drug is consumed by the public.