Wiktionary
n. the age of an individual measure in days, months and years from the time the individual was born, often used in psychometrics
WordNet
n. age measured by the time (years and months) that something or someone has existed; "his chronological age was 71 years"
Usage examples of "chronological age".
Not even a man, really, if manhood was determined by chronological age.
She looked hurt and confused again and even younger than her chronological age.
Andreziana's emotional and physical exhaustion made her look, briefly, much older than her chronological age.
In the majority of cases we've cut the gap between reading and chronological age by fifty percent.
He was a vaguely good-looking man, rather lean, rather dark, his air and bearing older than one would expect from his chronological age of thirty.
He passed two little boys of apparently equal chronological age, perhaps ten.