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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 ?
A hierarchical multiple regression analysis was conducted to examine whether parenting factors predicted students' alcohol refusal efficacy and whether developmental age moderated this relationship.
To overcome this methodological difficulty, almost all developmental tests compute the developmental quotient (DQ = developmental age divided by chronological age x 100) as a relative measure.
In addition, comparing children with and without disabilities matched on developmental age can enhance our understanding of developmental similarities/differences that exist between groups and thereby facilitate the identification of appropriate intervention targets (Baumeister, 1967; Malone, 1999; Quinn & Rubin, 1984).
The mean developmental age for the children based on the Social Maturity Scale for Blind Preschool Children (Maxfield & Buchholz, 1957) was 45 months (3.
A major change since the introduction of a youth advocate is the restructuring of the youth group and church school to mirror developmental age categories more appropriately rather than public school age divisions.
When a disabled child becomes the "youngest" family member by virtue of his or her developmental age, young siblings may feel displaced and experience the burden of responsibilities that would ordinarily be delegated to an older child (Whaley & Wong, 1982).
Here are a few tips to help you decide which toys best suit your little one's developmental age.
Along with the activities, the app is designed to empower young girls and boys from an early developmental age with a nightly bedtime ritual of practiced positive imagination.
Now aged seven, he doesn't walk or talk, and has the developmental age of a six-month-old.
Isabella, who turns three today, doesn't talk and has the developmental age of a 12-month-old baby.
Equipment should meet British or European safety standards and inspectors should take into account the developmental age of the child, cultural and religious beliefs, disabilities, literacy levels, and whether English is the family's first language when making checks.

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