Definition of twentysomething
: having an age of 20 to 29 years old
a twentysomething professional … delves into the nightlives of twentysomething Easterners trying to survive as out-of-work actors in Los Angeles.— Joe Fox
also
: of or relating to people in their twenties
… many of the new songs evoke typical twentysomething drama. — Rolling Stone
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Time Traveler for twentysomething
The first known use of twentysomething was in 1990
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