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
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
Though more black and white, chronological age has a spectrum.
—Lindsey Leake, NBC news, 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
For decades, the dental community has debated whether chronological age should factor into implant treatment planning.
—Malana Vantyler, jsonline.com, 20 Feb. 2026
Another 2024 study published in Biology found that adults who did strength training had a lower biological age—suggesting that their bodies were deteriorating more slowly than is typical for their chronological age.
—Jamie Friedlander Serrano, Time, 3 Feb. 2026
Oura also launched metrics for comparing cardiovascular age and chronological age in 2024.
—Victoria Song, The Verge, 5 Jan. 2026
According to the Heart Foundation, cardiac age is a metric that evaluates a person's cardiovascular health and risk for heart attack in comparison to their chronological age.
—Kc Baker, PEOPLE, 28 Nov. 2025
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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
Though more black and white, chronological age has a spectrum.
—Lindsey Leake, NBC news, 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
For decades, the dental community has debated whether chronological age should factor into implant treatment planning.
—Malana Vantyler, jsonline.com, 20 Feb. 2026
Another 2024 study published in Biology found that adults who did strength training had a lower biological age—suggesting that their bodies were deteriorating more slowly than is typical for their chronological age.
—Jamie Friedlander Serrano, Time, 3 Feb. 2026
Oura also launched metrics for comparing cardiovascular age and chronological age in 2024.
—Victoria Song, The Verge, 5 Jan. 2026
According to the Heart Foundation, cardiac age is a metric that evaluates a person's cardiovascular health and risk for heart attack in comparison to their chronological age.
—Kc Baker, PEOPLE, 28 Nov. 2025
Cite this Entry
“Chronological age.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chronological%20age. Accessed 17 Mar. 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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