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
Oura also launched metrics for comparing cardiovascular age and chronological age in 2024.
—
Victoria Song, The Verge, 5 Jan. 2026
The group with the poorest sleep quality showed that their brains were approximately one year older than their chronological age.
—Ritsuko Kawai, Wired News, 31 Dec. 2025
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
Does your brain age match your chronological age?
—Kayla Hayempour, NBC news, 24 Nov. 2025
Advertisement Differences between biological age and chronological age speaks to the possibility that aging is malleable.
—Dominique Mosbergen, Time, 25 Sep. 2025
Across blood, saliva and urine, her biological age was significantly younger than her chronological age on multiple independent clocks.
—New Atlas, 24 Sep. 2025
Biological age is different from chronological age.
—Scott Lafee, San Diego Union-Tribune, 19 Aug. 2025
Being able to see heart age and chronological age side by side makes heart health easier to understand, Nour Makarem, PhD, cardiovascular epidemiologist and assistant professor at the Columbia University Mailman School of Public Health, told Health.
—Kristen Fischer, Health, 9 Aug. 2025
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Victoria Song, The Verge, 5 Jan. 2026
The group with the poorest sleep quality showed that their brains were approximately one year older than their chronological age.
—Ritsuko Kawai, Wired News, 31 Dec. 2025
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
Does your brain age match your chronological age?
—Kayla Hayempour, NBC news, 24 Nov. 2025
Advertisement Differences between biological age and chronological age speaks to the possibility that aging is malleable.
—Dominique Mosbergen, Time, 25 Sep. 2025
Across blood, saliva and urine, her biological age was significantly younger than her chronological age on multiple independent clocks.
—New Atlas, 24 Sep. 2025
Biological age is different from chronological age.
—Scott Lafee, San Diego Union-Tribune, 19 Aug. 2025
Being able to see heart age and chronological age side by side makes heart health easier to understand, Nour Makarem, PhD, cardiovascular epidemiologist and assistant professor at the Columbia University Mailman School of Public Health, told Health.
—Kristen Fischer, Health, 9 Aug. 2025
Cite this Entry
“Chronological age.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chronological%20age. Accessed 28 Jan. 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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