empty nester 
noun informal, chiefly North American
A parent whose children have grown up and left home.Then there are folks like these two, who in demographic parlance are baby boomers turned empty nesters....
- Mostly I'm looking forward to being just 40 something when I'm an empty nester.
- Their most important customers are the empty nesters.
- discriminating cubic
- discriminatingly
- discriminating monopoly
- discrimination
- discriminational
- discrimination learning
- discriminative
- discriminatively
- discriminator
- discriminatory
- discrown
- disc sander
- disc-shaped
- disc signal
- disc space
- disc steam engine
- disc storage
- disc system
- disc telegraph
- disculp
- disculpate
- disculpation
- disculpatory
- discumbency
- discumber