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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 classic literature ?
Beside its primary value as the first chapter of the history of Europe, (the mythology thinly veiling authentic facts, the invention of the mechanic arts and the migration of colonies,) it gives the history of religion, with some closeness to the faith of later ages.
MY FAVOURITE COLOUR Age 5+; Code 087 OFF TO SCHOOL Age 5+; Code 082 introduce new experiences and his learn around COLOURS AND SHAPES Age 2-4; Code 020 great for helping learning skills and children for on Age MAGIC SPELLS Age 5+; Code 088 STICKER SWAPS Age 5+; Code 083 children to concepts and as Harry dinosaurs about the world them.
The percentage of live births with twins has decreased only slightly over time, but only in the three youngest age categories.
Type of participants: String, woodwind, brass and percussion instrumentalists and ensembles Age or grade level Secondary.
From measures of its activity, doctors might gauge a person's physiological age.
Hypertension was most common among the youngest and oldest mothers (affecting 8% and 11%, respectively), and rates of tobacco dependence and infection of the amniotic cavity declined with age (from 2-3% among teenagers to less than 2% among women aged 40 or older).
Many in hollywood's glamour sets, who never seem to age like you or I, have a special secret to tell, and even space pioneer and US Senator John Glen stays vital with HGH.
1,000 First Prize * "The Human Genome Project: The International Project that Will Most Benefit Humanity" by Jennifer Gutierrez, age twenty-two
The taking of the drug is used as a metaphor of cultural expectations illustrating how men are required to age well.
Stella, Age 8 Swimming, eating Smoothies, reading & relaxing
A striking feature of the human epidemic has been the young age of most patients and the lack of any trend toward older ages in patients dying later in the epidemic.
Hobson joined Ariel Capital Management Inc, at age 21, still a wet-behind-the-ears intern.