Adult Costume Policy Any adult or teen (i.e., anyone age 13 or older) wearing costumes on Zoo grounds must have previously negotiated an agreement with an authorized officer of the Saint Louis Zoo. Individuals other than children under age 13 wearing costumes without a previous agreement with the Saint Louis Zoo shall be prohibited from entering the Zoo. A “costume” includes having one’s face painted. Adults and teens wearing costumes and being accompanied by a child or children under the age of 13 years of age are permitted on Zoo grounds to participate in appropriate Zoo-sponsored events during which costumes traditionally are worn (e.g., Halloween theme parties) with the exception that the face of any person in costume age 13 or older must be entirely visible and cannot be concealed in any manner by a mask or paint of any kind.