Your age is the number of years you've been alive. If your cat is six, you can say that he's "six years of age."

You can also talk about a stage of life or an era in history as an age: "School age kids need to get outside and play every day." Often when someone mentions age as a concept or idea, they mean old age, or being elderly. And the verb age means "grow older." The word comes from the Old French aage, "age or lifetime," from the Latin root aevum, "lifetime, eternity, or age."

Definitions of age
  1. noun
    how long something has existed
    “it was replaced because of its age
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    chronological age
    age measured by the time (years and months) that something or someone has existed
    bone age
    a person's age measured by matching their bone development (as shown by X rays) with bone development of an average person of known chronological age
    developmental age
    a measure of a child's development (in body size or motor skill or psychological function) expressed in terms of age norms
    fertilization age, fetal age, gestational age
    the age of an embryo counting from the time of fertilization
    mental age
    the level of intellectual development as measured by an intelligence test
    the quality of being old; the opposite of newness
    the quality of being new; the opposite of oldness
    the opposite of youngness
    the opposite of oldness
    obsoleteness, superannuation
    the property of being out of date and not current
    ancientness, antiquity
    extreme oldness
    the property of being no longer fashionable
    time of origin, vintage
    the oldness of wines
    great age (especially grey or white with age)
    the property of being very new
    the property of being pure and fresh (as if newly made); not stale or deteriorated
    recency, recentness
    the property of having happened or appeared not long ago
    agedness, senescence
    the property characteristic of old age
    the state of being senile
    longevity, seniority
    the property of being long-lived
    having lost purity and freshness as a consequence of aging
    juvenility, youth, youthfulness
    the freshness and vitality characteristic of a young person
    childishness, puerility
    a property characteristic of a child
    type of:
    a basic or essential attribute shared by all members of a class
  2. noun
    a time of life (usually defined in years) at which some particular qualification or power arises
    “she was now of school age
    synonyms: eld
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    age of consent
    the minimum age for marrying without parental consent or the minimum age for consensual sexual relations; intercourse at an earlier age can result in a charge of assault or statutory rape; the age differs in different states of the Union
    legal age, majority
    the age at which persons are considered competent to manage their own affairs
    minority, nonage
    any age prior to the legal age
    drinking age
    the age at which is legal for a person to buy alcoholic beverages
    voting age
    the age at which a person is old enough to vote in public elections
    type of:
    time of life
    a period of time during which a person is normally in a particular life state
  3. noun
    a late time of life
    age hasn't slowed him down at all”
    synonyms: eld, geezerhood, old age, years
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    dotage, second childhood, senility
    mental infirmity as a consequence of old age; sometimes shown by foolish infatuations
    type of:
    time of life
    a period of time during which a person is normally in a particular life state
  4. noun
    a prolonged period of time
    “we've known each other for ages
    synonyms: long time, years
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    month of Sundays
    a time perceived as long
    aeon, eon
    an immeasurably long period of time
    blue moon
    a long time
    year dot
    as long ago as anyone can remember
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    period, period of time, time period
    an amount of time
  5. verb
    grow old or older
    “She aged gracefully”
    “we age every day--what a depressing thought!”
    synonyms: get on, maturate, mature, senesce
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    become officially one year older
    fossilise, fossilize
    become mentally inflexible
    be foolish or senile due to old age
    type of:
    grow, progress, unfold, or evolve through a process of evolution, natural growth, differentiation, or a conducive environment
  6. verb
    begin to seem older; get older
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    type of:
    grow, progress, unfold, or evolve through a process of evolution, natural growth, differentiation, or a conducive environment
  7. verb
    make older
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    make younger or more youthful
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  8. noun
    an era of history having some distinctive feature
    “we live in a litigious age
    synonyms: historic period
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    Age of Reason
    a movement in Europe from about 1650 until 1800 that advocated the use of reason and individualism instead of tradition and established doctrine
    Elizabethan age
    a period in British history during the reign of Elizabeth I in the 16th century; an age marked by literary achievement and domestic prosperity
    Victorian age
    a period in British history during the reign of Queen Victoria in the 19th century; her character and moral standards restored the prestige of the British monarchy but gave the era a prudish reputation
    Baroque period
    the historic period from about 1600 until 1750 when the baroque style of art, architecture, and music flourished in Europe
    Middle Ages
    the period of history between classical antiquity and the Italian Renaissance
    the period of European history at the close of the Middle Ages and the rise of the modern world; a cultural rebirth from the 14th through the middle of the 17th centuries
    Italian Renaissance
    the early period when Italy was the center of the Renaissance
    technological revolution
    the transformation from an agricultural to an industrial nation
    Reign of Terror
    the historic period (1793-94) during the French Revolution when thousands were executed
    Harlem Renaissance
    a period in the 1920s when African-American achievements in art and music and literature flourished
    New Deal
    the historic period (1933-1940) in the United States during which President Franklin Roosevelt's economic policies were implemented
    Reconstruction Period
    the period after the American Civil War when the southern states were reorganized and reintegrated into the Union; 1865-1877
    the reign of Charles II in England; 1660-1685
    Great Depression
    a period during the 1930s when there was a worldwide economic depression and mass unemployment
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    the historic period preceding the Middle Ages in Europe
    golden age
    any period (sometimes imaginary) of great peace and prosperity and happiness
    Jazz Age
    the 1920s in the United States characterized in the novels of F. Scott Fitzgerald as a period of wealth, youthful exuberance, and carefree hedonism
    the period during which a monarch is sovereign
    turn of the century
    the period from about ten years before to ten years after a new century
    type of:
    epoch, era
    a period marked by distinctive character or reckoned from a fixed point or event
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