啃老族

kěnlǎozú
(coll.) adults still living with and depending on their parents

CEDICT

colloquial

Entry Composition

1 啃老 kěnlǎo (coll.) to live with and depend on one's parents even upon reaching adulthood
2 族 zú
  1. race
  2. nationality
  3. ethnicity
  4. clan
  5. by extension, social group (e.g. office workers 上班族)