Thirtysomething Definition
  thirtysomethings
  
    noun
  
 A person whose age is between thirty and thirty-nine years, inclusive; someone in his or her thirties.
Wiktionary 
    adjective
  
 Between 30 and 39 years of age.
 Wiktionary 
Between 30 and 39 in number.
 Wiktionary 
Other Word Forms of Thirtysomething
Noun
Singular:
 thirtysomethingPlural:
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