Vicenarian Definition
    adjective
  
 Between the ages of 20 and 29, inclusive. In one's third decade.
Wiktionary 
    noun
  
 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.
Wiktionary 
Other Word Forms of Vicenarian
Noun
Singular:
 vicenarianPlural:
 vicenariansOrigin of Vicenarian
-  From Latin vicenārius (“of or containing twenty”), from vigintī (“twenty”) + -an From Wiktionary 
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