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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 ?
Lead researcher Prof James Timmons, from King's College London, said: "Our discovery provides the first robust molecular 'signature' of biological age in humans and should be able to transform the way 'age' is used to make medical decisions.
The calendar indicated that all those people were 38 years old at the time of the study, but their biological ages ranged from 28 to 61, researchers report July 6 in the Proceedings of the National Academy of Sciences.
Each person's biological age was measured from a blood sample at the outset, and participants were followed up throughout the study.
The results showed that people with biological age greater than their true age were more likely to die sooner than those whose biological and actual ages were the same.
12 (with the differences between arterial and biological age, and Aix Brach, respectively).
It aims to give a person's true biological age rather than the actual chronological age and may lead to the prediction of a human lifespan.
METHODS: Cropped skin cheek images from 170 girls and women (11-76 years) were blind-rated for attractiveness, healthiness, youthfulness, and biological age by 353 participants.
The degree of premature hair graying as an independent risk marker for coronary artery disease: A predictor of biological age rather than chronological age.
A Trading Standards spokesman said: "We are warning residents to be cautious after we have received a number of complaints about the activities of traders who are visiting consumers' homes and using electronic devices, which they claim can determine cardiovascular health, blood pressure and the biological age of the subject.
The Biggest Loser (ITV1, 9pm) The team get a reality check tonight when they visit the University of Birmingham and their School of Sports and Exercise to learn their biological age and are told that if they carry on as they are they can only expect to live for another fifteen years.
By reactivating telomerase, they rejuvenated worn out organs in mice that were the equivalent biological age to 80-year-old humans.
However, what is more important in how you look and feel and how long you will live is your biological age.

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