High housing costs are only part of the reason young adults are staying home in greater numbers than ever before. Some may be ââ?¬Å?boomerangsââ?¬Â who tried life on their own and came back to the nest, but experts are increasingly aware of the adults who never really left. They’re the ones who may have gone to college but were never really independent or fully launched from the nest because Mom and Dad paid the bills.