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Related to chronologic 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 ?
That implies these features are fully accounted for by chronologic age and conventional cardiovascular risk factors.
Premature infants should be immunized at their appropriate chronologic ages and not at corrected ages.
Chronologic age and skeletal maturation of the cervical vertebrae and hand-wrist:Is there a relationshipAm J Orthod Dentofacial Orthop 2006; 10: 622-28.
LOS ANGELES -- If you look old for your chronologic age, chances are your coronary arteries are undergoing accelerated biologic aging, too, judging from findings in a new report from the landmark Copenhagen City Heart Study.
Besides, chronologic age has been identified as a potent, independent risk for reduced CV capacity and a plethora of heart diseases, with other modifiable risk factors acting as accelerators.
Ready for immediate use is the following: Male infertility work-ups sometimes lead to diagnosis of testosterone levels that are low for chronologic age.
Data have been published since 2003 which have shown that the only factor consistently associated with an increased risk of RSV hospitalization is a chronologic age of less than 90 days.
Physical Examination: The patient's appearance was physically consistent with her chronologic age.
It may also help to identify individuals or subgroups among the heterogeneous older adult population that might be susceptible to environmental agents because it has been shown to be a better predictor of adverse outcomes in older adults than chronologic age (Schuurmans et al.
The timing of peak concentrations of PINP in relation to chronologic age coincided with the timing of peak height velocity in each gender on a population basis.
Those children who had demonstrated average ability in reading, writing, or spelling, or whose estimated developmental age was at least 80% of chronologic age were excluded.
1994 reported that the first tooth erupts at the usual chronologic age in healthy premature infants.