As used in this chapter, the following terms shall have the meanings indicated:
Any person, partnership or corporation who, through any means, buys or sells gold, silver, precious metals or jewelry and includes anyone advertising the purchase or sale of any of the aforementioned items. "Dealer" shall not include anyone engaged in the casual purchase or sale of any personally owned jewelry nor include such purchases or sales which are not related to the conduct of a business.
Any person under the age of 18 years.