At 16 with a Norwood Class 3 pattern of balding evident, I would want to know more about your family history. Is there advanced balding in the family (father, brothers, grandfathers, uncles) and if so, how young were these relatives when the balding finalized their pattern? Drugs like oral Minoxidil might work. Even drugs like finasteride have been found safe for boys 14 and up, based upon a recent polling I did with about 60 experts in the field. If you are fully grown, then finasteride ss a reasonable option, but you need to have a conversation with a knowledgeable doctor and have your parents present during that conslutation.