how do I go about discontinuing child support when my child is turning 21 in April 2013?

First, you need to know that in New Jersey, child support terminates when a child is deemed to be "emancipated."  Emancipation does not necessarily happen when a child is 21 years old.  It could be earlier and it could be later, based on the specific facts.   If you do qualify for a termination of your child support obligation, you most likely will have to file a formal Motion to the Court which entered the child support obligation.  However, even that answer varies, based on the specific facts.  I have more than 30 years of legal experience and head a law firm which devotes its entire practice to New Jersey Divorce and Family Law matters.  I would be happy to have a brief telephone call with you, to get more facts and to answer any other questions that you may have.  There is no charge for that phone call.  My firm’s telephone number is listed below.   Please also feel free to take a look at our Firm Website (www.salvaggiolaw.net), which contains a lot of helpful information. David F. Salvaggio, Esq.