twen‧ty‧some‧thing /ˈtwentiˌsʌmθɪŋ/
noun [countable] informal someone who is between the ages of 20 and 29 ⇒
thirtysomething:
A crowd of twentysomethings were gathered outside the club.—twentysomething adjective [TahlilGaran] Dictionary of Contemporary English ▲