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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 ?
Children with Down syndrome showed a statistically significant inferior performance in these two skills, only when compared to children with typical development of the same chronological age.
The four articles in this special focus address different thematic areas in different contexts of forced migration, but they share some common themes that help to advance understanding of discrimination on the basis of chronological age, biological development, and family status.
The term "cognitively young" is used to describe people who feel like they are younger than their chronological age (Birtwistle & Tsim, 2005), a feeling that is justified by the more positive way they look at life (Amaro, Johann and Meira, 2007).
gov/view/cdc/33002) demonstrates the effect of CVD risk factors included in non-laboratory-based FRS heart age calculations on population mean excess heart age estimates stratified by sex and chronological age.
2013), we divide the elderly into two groups: those with a cognitive age the same as the chronological age (people who feel they are their age) and those with a cognitive age lower than their chronological age (people who feel that they are younger).
Chronological age of respective patients was recorded to evaluate skeletal maturation with respect to chronological age.
Table-I: Differences and relationship between chronological age (CA) and bone age by Greulich and Pyle Atlas (GP) in different genders.
Table 2 shows the cross-tabulation of self-reported chronological age and the degree of fusion.
The centre, under the Dubai Health Authority (DHA), claims to house the first diagnostic machine in the country that determines the gap between functional and chronological age.
1) The number and size of epiphyseal centres demonstrable at a given chronological age.
A study of Seychelles warblers living on a small island in the Indian Ocean suggests that the length of telomeres--bits of DNA that cap chromosome ends--can predict a bird's chance of dying better than its chronological age can.