In custody matters, there is no legal authority to make a custody order once the child reaches the age of 18 years. In child support matters, parents are responsible to support their child until the age of 21 years. Child support can be extended beyond the age of 21 by agreement. For example, parents may choose to support a child until he or she reaches age 22 or completes a four-year college degree or longer. In addition, a health insurance plan may allow a parent to keep their child insured until the age of 26. Terms pertaining to this issue can be negotiated and agreed to by the parties for the benefit of the child.