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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.
a particular period of history, as distinguished from others; a historical epoch:
the age of Pericles; the Stone Age; the age of electronic communications.
the period of history contemporary with the span of an individual’s life:
He was the most famous architect of the age.
a generation or a series of generations:
ages yet unborn.
a great length of time:
I haven’t seen you for an age. He’s been gone for ages.
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.
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.
Geology.

a period of the history of the earth distinguished by some special feature:
the Ice Age.
a unit of geological time, shorter than an epoch, during which the rocks comprising a stage were formed.

any of the successive periods in human history divided, according to Hesiod, into the golden, silver, bronze, heroic, and iron ages.
Cards.

Poker. the first player at the dealer’s left.
Compare (def 10a).
.

to grow old:
He is aging rapidly.
to mature, as wine, cheese, or wood:
a heavy port that ages slowly.
to make old; cause to grow or seem old:
Fear aged him overnight.
to bring to maturity or a state fit for use:
to age wine.
to store (a permanent magnet, a capacitor, or other similar device) so that its electrical or magnetic characteristics become constant.
to expose (a dye or dyed cloth) to steam or humid air in order to fix the dye.
to stabilize the electrical properties of (a device) by passing current through it.
of age, Law.

being any of several ages, usually 21 or 18, at which certain legal rights, as voting or marriage, are acquired.
being old enough for full legal rights and responsibilities.

Contemporary Examples

But it may never be cheaper to replace these aging arteries than it is now.
Pay to Fix America’s Crumbling Infrastructure Now, or Pay More Later David Cay Johnston May 24, 2013

In Zoolander, he was the aging supermodel who cannot fathom the idea that the universe doesn’t revolve around him.
Ben Stiller’s Daddy Issues Jacob Bernstein April 19, 2011

These passages feel the most lived in; aging, for Rebecca Winter, is less frightening than obsolescence.
This Week’s Hot Reads: Jan. 27, 2014 Thomas Flynn January 26, 2014

Scientists have pinpointed the exact part of our DNA that links stress to aging.
The New Science of Reverse Aging Danielle Friedman November 6, 2010

But even as our culture has become more open toward polyamory and BDSM, the combination of sex and aging are still seen as taboo.
Erotic Lit Your Grandmother Will Like Rachel Kramer Bussel July 8, 2013

Historical Examples

She thinks you are aging too rapidly and that you must find a way out of your sorrow.
Dreamy Hollow Sumner Charles Britton

Yes, my father was aging fast, I would soon be the only breadwinner here.
The Harbor Ernest Poole

And the disorder in her moral life had hastened the aging process more even than she was aware of.
December Love Robert Hichens

He realized that the nervous strain and anxiety of waiting was aging him.
Salvage in Space John Stewart Williamson

The now aging professionals saw the wave of interest in Squash Racquets and climbed aboard.
Squash Tennis Richard C. Squires

noun
the period of time that a person, animal, or plant has lived or is expected to live: the age of a tree, what age was he when he died?, the age of a horse is up to thirty years
the period of existence of an object, material, group, etc: the age of this table is 200 years

a period or state of human life: he should know better at his age, she had got beyond the giggly age
(as modifier): age group

the latter part of life

a period of history marked by some feature or characteristic; era
(capital when part of a name): the Middle Ages, the Space Age

generation: the Edwardian age
(geology, palaeontol)

a period of the earth’s history distinguished by special characteristics: the age of reptiles
the period during which a stage of rock strata is formed; a subdivision of an epoch

(myth) any of the successive periods in the legendary history of man, which were, according to Hesiod, the golden, silver, bronze, heroic, and iron ages
(often pl) (informal) a relatively long time: she was an age washing her hair, I’ve been waiting ages
(psychol) the level in years that a person has reached in any area of development, such as mental or emotional, compared with the normal level for his chronological age See also achievement age, mental age
age before beauty, (often said humorously when yielding precedence) older people take precedence over younger people
of age, adult and legally responsible for one’s actions (usually at 18 or, formerly, 21 years)
verb ages, ageing, aging, aged
to grow or make old or apparently old; become or cause to become old or aged
to begin to seem older: to have aged a lot in the past year
(brewing) to mature or cause to mature
n.

late 13c., “long but indefinite period in human history,” from Old French aage (11c., Modern French âge) “age; life, lifetime, lifespan; maturity,” earlier edage, from Vulgar Latin *aetaticum (source of Spanish edad, Italian eta, Portuguese idade “age”), from Latin aetatem (nominative aetas), “period of life, age, lifetime, years,” from aevum “lifetime, eternity, age,” from PIE root *aiw- “vital force, life, long life, eternity” (see eon). Meaning “time something has lived, particular length or stage of life” is from early 14c. Used especially for “old age” since early 14c. Expelled native eld.
v.

“to grow old,” late 14c., from age (n.). Meaning “to make old” is early 15c. Related: Aged; aging.

aging ag·ing (ā’jĭng)
n.

The process of growing old or maturing.

The gradual changes in the structure of a mature organism that occur normally over time and increase the probability of death.

age (āj)
n.
The length of time that one has existed; duration of life. v.

To become old.

To manifest traits associated with old age.

acute gastroenteritis

used to denote the period of a man’s life (Gen. 47:28), the maturity of life (John 9:21), the latter end of life (Job 11:17), a generation of the human race (Job 8:8), and an indefinite period (Eph. 2:7; 3:5, 21; Col. 1:26). Respect to be shown to the aged (Lev. 19:32). It is a blessing to communities when they have old men among them (Isa. 65:20; Zech. 8:4). The aged supposed to excel in understanding (Job 12:20; 15:10; 32:4, 9; 1 Kings 12:6, 8). A full age the reward of piety (Job 5:26; Gen. 15:15).

see:

act one’s age
coon’s age
golden age
in this day and age
of age
ripe old age
under age