chronological age
noun
: the age of a person as measured from birth to a given date
His chronological age is five, but his mental age is three—he thinks and behaves like a three-year-old.
Examples of chronological age in a Sentence
Recent Examples on the Web
There are many ways to mark life’s phases—biological development, achievements, simple chronological age.
—
Kelefa Sanneh, New Yorker, 24 Apr. 2026
Over time, Oura also measures your cardio capacity, cardiovascular age, and sleep regularity, while Whoop tracks physiological age (which may differ from your chronological age) and pace of aging.
—Andrew Gebhart, PC Magazine, 22 Apr. 2026
That is, your chronological age, which measures how many years have passed since you were born, may not match your biological age, which reflects wear and tear on your body at a cellular level.
—Kayla Hayempour, NBC news, 5 Apr. 2026
Researchers have determined that the length of telomeres is correlated with chronological age throughout a person’s life.
—Ashley MacKin Solomon, San Diego Union-Tribune, 30 Mar. 2026
Biological aging refers to the pace of aging on a cellular level, which is often different from chronological age.
—Angelica Stabile, FOXNews.com, 13 Mar. 2026
The findings came from blood samples of 958 participants with an average chronological age of 70, who were taking the multivitamin–multimineral supplement Centrum Silver.
—Sara Moniuszko, USA Today, 10 Mar. 2026
Because biological age is so variable, people of the same chronological age can sometimes look very different.
—Tom Gavin, EverydayHealth.com, 9 Mar. 2026
Epigenetic aging — a measurement of one’s biological age instead of chronological age — was most advanced in men, according to the study.
—Sandee Lamotte, CNN Money, 26 Feb. 2026
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Kelefa Sanneh, New Yorker, 24 Apr. 2026
Over time, Oura also measures your cardio capacity, cardiovascular age, and sleep regularity, while Whoop tracks physiological age (which may differ from your chronological age) and pace of aging.
—Andrew Gebhart, PC Magazine, 22 Apr. 2026
That is, your chronological age, which measures how many years have passed since you were born, may not match your biological age, which reflects wear and tear on your body at a cellular level.
—Kayla Hayempour, NBC news, 5 Apr. 2026
Researchers have determined that the length of telomeres is correlated with chronological age throughout a person’s life.
—Ashley MacKin Solomon, San Diego Union-Tribune, 30 Mar. 2026
Biological aging refers to the pace of aging on a cellular level, which is often different from chronological age.
—Angelica Stabile, FOXNews.com, 13 Mar. 2026
The findings came from blood samples of 958 participants with an average chronological age of 70, who were taking the multivitamin–multimineral supplement Centrum Silver.
—Sara Moniuszko, USA Today, 10 Mar. 2026
Because biological age is so variable, people of the same chronological age can sometimes look very different.
—Tom Gavin, EverydayHealth.com, 9 Mar. 2026
Epigenetic aging — a measurement of one’s biological age instead of chronological age — was most advanced in men, according to the study.
—Sandee Lamotte, CNN Money, 26 Feb. 2026
Cite this Entry
“Chronological age.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chronological%20age. Accessed 1 May. 2026.
Copy CitationMedical Definition
chronological age
noun
chro·no·log·i·cal age
ˌkrän-ᵊl-ˌäj-i-kəl-, ˌkrōn- 
: the age of a person as measured from birth to a given date compare achievement age
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