As used in this chapter, the following terms shall have the meanings indicated:
Any person 18 years of age or older.
Any person under the age of 18.
Remaining idle in essentially one location and shall include the concepts of spending time idly, loafing or wailing about aimlessly, and shall also include the colloquial expression "hanging around."
Include not only streets, alleys and sidewalks, but those establishments generally open for the public convenience and use.