twentysomethingnoun [ C ]
uk/ˈtwentiˌsʌmθɪŋ/usinformal MARKETINGa person between 20 and 29 years old:
Many of today's twentysomethings would rather work part time.
twentysomething
adjective [ before noun ]
Many twentysomething entrepreneurs make their fortunes on the internet.
Compare
thirtysomething