A short-term shelter and services to runaway youth and homeless youth who voluntarily enter the facility. A youth cannot stay in a RHYS for more than 21 consecutive days from the date of admission. A RHYS serves youth 12 to 17 years of age, inclusive, or 18 and completing high school or its equivalent, who are in need of services and without a place of shelter (homeless youth), or who have run away from their home or place of legal residence without permission of a parent, legal guardian, or foster parent (runaway youth).