achievement age

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1. the duration, or the measure of time of the existence of a person or object.
2. to undergo change as a result of passage of time.
achievement age a measure of achievement expressed in terms of the chronologic age of a normal child showing the same degree of attainment.
chronologic age the actual measure of time elapsed since a person's birth.
developmental age
1. age estimated from the degree of anatomical development.
2. in psychology, the age of an individual determined by degree of emotional, mental, anatomical, and physiological maturation.
gestational age see gestational age.
mental age the age level of mental ability of a person as gauged by standard intelligence tests.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

a·chieve·ment age

age derived from a given level of achievement on a standardized test, which can be compared with a person's chronologic age.
Farlex Partner Medical Dictionary © Farlex 2012

a·chieve·ment age

(ă-chēv'mĕnt āj)
The relationship between the chronologic age and the age of achievement, as established by standard achievement tests.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012