If police believe that a juvenile has committed an illegal act, then the law allows them to
take the juvenile into custody.
ignore the juvenile's activity.
try the juvenile as an adult.
place the juvenile under arrest.

If police believe that a juvenile has committed an illegal act, then the law allows them to take the juvenile into custody. A person is only considered a juvenile if he/she is a minor above 10 years old and generally below 18. Underage can also be applied to people above the age majority, but below a certain age limit such as drinking, marriage, smoking, driving, or voting.

Since wxyz is 4, halfof that would be 2.