Greenberg does not say you can just quit, retire and stop paying alimony. It simply recognizes that the payor may have a claim for modification using his/her retirement as a material change in circumstance and warranting a review of the alimony provisions of the judgment. The review remains much broader than simply confirming the payor’s retirement.
The new law, effective 3/1/12, codifies Greenburg’s (and several other cases’) view that when the payor reaches the age of eligibility for Social Security, the alimony provisions may be reviewed (but not neccessarily altered) under a complaint for modification.
This is not legal advice and is not intended to create an attorney-client relationship. You should speak to an attorney for further information.