tricenarian

  1. Adjective.  Between the ages of 30 and 39. In one's fourth decade.
  2. Noun.  A person whose age is between thirty and thirty-nine years, inclusive; someone in his or her thirties. Someone in his or her fourth decade.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.