<p><strong>Noun</strong></p><ul><li>The length of time during which a being or thing has existed; length of life or existence to the time spoken of or referred to: trees of unknown age; His age is 20 years.</li><li>A period of human life, measured by years from birth, usually marked by a certain stage or degree of mental or physical development and involving legal responsibility and capacity: the age of discretion; the age of consent; The state raised the drinking age from 18 to 21 years.</li><li>The particular period of life at which a person becomes naturally or conventionally qualified or disqualified for anything: He was over age for military duty.</li><li>One of the periods or stages of human life: a person of middle age.</li><li>Advanced years; old age: His eyes were dim with age.</li><li>A particular period of history, as distinguished from others; a historical epoch: the age of Pericles; the Stone Age; the age of electronic communications.</li><li>The period of history contemporary with the span of an individual's life: He was the most famous architect of the age.</li><li>A generation or a series of generations: ages yet unborn.</li><li>A great length of time: I haven't seen you for an age. He's been gone for ages.</li><li>The average life expectancy of an individual or of the individuals of a class or species: The age of a horse is from 25 to 30 years.</li><li>Psychology: the level of mental, emotional, or educational development of a person, especially a child, as determined by various tests and based on a comparison of the individual's score with the average score for persons of the same chronological age.</li><li>Geology: a period of the history of the earth distinguished by some special feature: the Ice Age.</li><li>A unit of geological time, shorter than an epoch, during which the rocks comprising a stage were formed.</li><li>Any of the successive periods in human history divided, according to Hesiod, into the golden, silver, bronze, heroic, and iron ages.</li><li>Cards: Poker: the first player at the dealer's left.</li></ul>