1. thirtysomething - Noun
2. thirtysomething - Adjective
thirtysomething (plural thirtysomethings)
A tricenarian: a person in their thirties, a person aged between 30 and 39 years (inclusive).
Between 30 and 39 years of age.
Between 30 and 39 in number.
Source: en.wiktionary.org