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Related to chronological age: mental age, biological age


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 ?
Given the heterogeneity in the objective and subjective experience of aging, it may make sense to replace a focus on chronological age with one that emphasizes functional abilities within prison.
Social age analysis provides an opportunity to reconcile these seemingly opposing views on chronological age by recognizing both the utility of chronological age-disaggregated data, as well as the importance of social age, particularly local meanings ascribed to the life cycle and generational power relations.
Similarly to humans, somatic tissues of chickens exhibit telomere shortening and decreasing telomerase activity with chronological age (Taylor and Delany, 2000; Cho et al.
This encompasses not only their chronological age, but also their cognitive, emotional, language, and behavioral development.
In their mind's eye they actually feel younger than their chronological age, compared to previous generations.
This explains why some people can pass off as 10 years younger than their chronological age, while others look and feel a decade older than they are.
She invites readers to set and reach new goals in the process of living a purposeful life rather than leading an existence of mindless habit, regardless of chronological age.
But the good news is that we can slow down the ageing process and still look ten years younger than our chronological age if we look after ourselves, starting now.
This work demonstrated that arNOX activity is found in both the epidermis and dermis at both sun-exposed and non-sun-exposed sites and arNOX activity correlated with chronological age.
estimation of chronological age, may be required [1] The main criteria for forensic age determination in the relevant age group based on odontological examination are tooth eruption and tooth mineralization, both developmental biological features.
She told the Gazette: "Literacy levels of some of the pupils in Middlesbrough are below their chronological age.
He just doesn't think current attempts, which include limiting the number of pitches thrown based on a player's chronological age, have much validity.