I am paying child support for my son who is now 25. I was behind for a couple of years?

I am paying child support for my son who is now 25. I was behind for a couple of years I am now catching up. There is a claus in my divorce papers that says I must pay 50% of my pension to my ex wife once I can draw from it. She has since re-married and my children are now adults. Does anyone know if I still must relinguish half of my pension to my ex-wife, even though she is since remarried. Is there a way I can stop that from happening? Or does the courts still honor the original papers? Any information is appreciated.