1
noun
number of years which a person has lived; what's your age on your next birthday?; he was sixty years of age; she looks younger than her age; the size varies according to age
mental age = age of a person's mental state, measured by intelligence tests (usually compared to that of a normal person of the same chronological age)
old age = period when a person is old (usually taken to be after the age of sixty-five)
2
verb
to grow old