chronological age

noun Psychology.
the number of years a person has lived, especially when used as a standard against which to measure behavior, intelligence, etc.
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Medical Dictionary

chronological age chron·o·log·i·cal age (krŏn'ə-lŏj'ĭ-kəl)
n.
Abbr. CA, C.A.
The number of years a person has lived, used especially in psychometrics as a standard against which certain variables, such as behavior and intelligence, are measured.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Normal variation in the length of the follicular phase of the menstrual cycle: effect of chronological age.
His chronological age does not correspond to his developmental age in these areas.
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