As used in this chapter, the following definitions shall apply:
Any person under the age of 18 years.
Any natural parent of a minor, a guardian or adult person 21 years of age or over who is responsible for the care and custody of a minor.
Any public street, highway, road, alley, park, playground, public building or vacant lot.
To loiter, loaf, wander, stroll, or play in or upon, whether within or without or upon a vehicle.