Aus: http://owad.de/check.php4?id=2142&choice=1&sid=1242788:

 empty nesters  

noun phrase

– parents whose children no longer live at home




…an increasing number of adult children between 25 and 34 still live at home. They are sometimes referred to as „boomerang kids,“ meaning they temporarily leave home and then return because of financial difficulties, divorce or the decision to extend their education.