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.
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.
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.
one of the periods or stages of human life: a person of middle age.
advanced years; old age: His eyes were dim with age.