This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Between the ages of 20 and 29, inclusive. In one's third decade.

n. A person whose age is between twenty and twenty-nine years, inclusive; someone in his or her twenties. Someone in his or her third decade.

Victorian    Vincentian    vegetarian   

twentysomething   

tricenarian    sexagenarian    denarian    nonagenarian    octogenarian