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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 ?
Earlier study conducted on bania girls from Mandi Gobindgarh reported median menarcheal age of 12.
Study to determine the menarcheal age of school going girls at Jhalawar district, Rajasthan.
Growth status and menarcheal age among adolescent schoolgirls of Punjab.
19 The average menarcheal age in Indo-Pakistani girls by another study done in 1991 was demonstrated to be 13.
These findings were supported by the studies conducted in India19 and in Turkey,18 which showed no association of the menarcheal age with the consumption of dairy products and eggs.
These findings were inconsistent with those in a study conducted in Turkey,23 which found the menarcheal age to be lowest in the low socioeconomic group and highest in the middle socioeconomic group.
The mean menarcheal age was calculated by the status quo method (menarche yes/no).
There was no significant association between mean height, weight and BMI and the menarcheal age (p values of 0.
In other words, though additional investigations are required in this regard, it is likely that the importance of demographic and socio-economic differences in the menarcheal age has been over-emphasised.
In the status quo method data regarding menarcheal age could be obtained by asking a girl of her current status that is she has had her first menses by the time of assessment and her birth date.
43%) girls had menarcheal age was 13 years or less, while 128 (36.
However Merzenich H et al (1993) reported menarcheal age group between 8-15 year while the study by Warren MP (1980) shows age group between 13-15 year.