empty nesters
From Longman Business DictionaryRelated topics: Advertising & marketingempty nestersˌempty ˈnesters noun [plural] MARKETING a couple whose children have left home. Marketers see them as a group ready to buy certain types of things such as smaller houses, particular types of holidays etcMarried couples without children, including ‘empty nesters’ as well as newly-married partners, form the largest single group of households at 36% of the total.