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a. a period of history marked by some feature or characteristic; era
b. (capital when part of a name): the Middle Ages; the Space Age
2. Geology palaeontol
a. a period of the earth's history distinguished by special characteristics
b. the period during which a stage of rock strata is formed; a subdivision of an epoch
3. 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
4. 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
5. of age adult and legally responsible for one's actions (usually at 18 or, formerly, 21 years)



in humans, a stage of development that is characterized by specific regularities of formation of the organism and personality and by relatively stable morphophysiological and psychological traits. While age is a stage in the biological maturing of the organism, a process controlled by genetic factors, it is also a concrete result and stage of the social-psychological development of the personality and is determined by the conditions of life, training, and upbringing.

The content and form of training and upbringing are historically composed and varied according to age; in their turn they affect the determination of the boundaries and possibilities of a given age. In contemporary pedagogy and developmental psychology, several ages are differentiated with respect to the known relationships of the boundaries: infancy (from birth to one year); pre-preschool, or early childhood (from one to three); preschool (from three to seven); early school age (from seven to ten years); juvenile, or middle school (from ten to 15); and late school, or early youth (15 to 18 years old). Beyond these limits there is no generally accepted classification in the literature; only old age is considered separately. With the increased longevity noted in the 20th century, gerontology and gerontopsychology have arisen as disciplines to study the problems of prolonging the active life of a human being. Each age has a characteristic structure of cognitive, emotional, and volitional properties and qualities; forms of behavior; types of relationships to the environment; and peculiarities of structure and functioning of various organs and systems of the organism. This structure, however, is not invariable: in the 20th century a general acceleration of the physical and mental development of children has been noted. On the other hand, educational theory, in solving the problem of optimizing training, widens the possibilities of age and the boundaries of acquiring knowledge. Training must take into account not only the level of development achieved but also the development perspectives (the concept of “zones of imminent development,” as formulated by L. S. Vygotskii): the teacher must know not only what is present in a child of a given age but also what can be achieved, given certain conditions, by the child in the near future.



Period of time from origin or birth to a later time designated or understood; length of existence.
Any one of the named epochs in the history of the earth marked by specific phases of physical conditions or organic evolution, such as the Age of Mammals.
One of the smaller subdivisions of the epoch as geologic time, corresponding to the stage or the formation, such as the Lockport Age in the Niagara Epoch.


(aerospace engineering)
References in periodicals archive ?
This recent exposure through the photograph is the reaffirmation of the age-old communal politics that Congress has been indulging in right from the beginning.
Worse than the images were the inherited practices: the Nazis systematized and intensified Christianity's age-old methods of forced deracination and ghettoization, denying legal and economic rights, expropriating property, defiling synagogues, looting and destroying Jewish homes and businesses, burning sacred and secular Jewish literature, forcing the wearing of badges of dishonor, and visiting upon Jews humiliating assaults, unspeakable torture, and repeated massacres.
James the Marxist in dialogue with James the Pan-Africanist, representing the actions of Toussaint L'Overture and others in words and actions, subtly but evidently places a diasporic sensibility of transported Africans against the mere Europeanization of the age-old rebellious impulse.
In doing so, they revived an age-old argument and gave it new relevance.
Might Stephen Mitchell's translation once again contribute to bridging the gap between India's age-old spiritual wisdom and the United States' contemporary spiritual search?
Natural conditioning is the age-old art and science of heating, cooling, lighting, and ventilating a building without the need for fuel.
Though abusing interns is an age-old tradition in the publishing world, and Craig will probably be pursuing a musical career after his summer with us, we feel it is our responsibility to say that Craig emphatically does not look like a chimpanzee.
After Shanika recites that age-old pithy adage, "Sticks and stones may break my bones, but words will never hurt me," the young girl claims to feel better.
A recent article in Smithsonian magazine described the resurgence of the age-old construction method, which enjoyed a millennia-long heyday before standardized lumber led to its decline in the mid-l9th century.
Enjoy an age-old tradition and a cheese the Italians take very seriously
The brave LMW corporate office building in Coimbatore, India, sets out to relate a modern society to tradition: the spaces and local climates are informed by contemporary technology and age-old South Indian patterns of living.
In Moving Day, Deacon focuses on a situation that's very familiar: that age-old question of whether to commit.