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 concept of biological age, distinct from chronological age, is gaining public traction, though often misinterpreted.
—
Juergen Eckhardt,
Forbes.com,
23 June 2026
Whoop tracks long-term metrics like physiological age (which may differ from your chronological age) and your pace of aging.
—
Andrew Gebhart,
PC Magazine,
16 June 2026
Measured across multiple DNA methylation clocks, her biological age came in at an average of 17 to 23 years younger than her chronological age.
—
Allison Palmer,
Fort Worth Star-Telegram,
15 June 2026
An October 2025 study in the British Journal of Dermatology found women aged 40 to 50 who looked younger than their chronological age shared a more resilient skin microbiome.
—
Allison Palmer
updated June 13,
Miami Herald,
13 June 2026
One possibility is that GLP-1 drugs might be narrowing the gap between chronological age and biological age, the apparent age of various tissues.
—
Lori Youmshajekian,
Scientific American,
8 June 2026
Imagine receiving a test result that tells you your body is biologically five years older than your chronological age.
—
Idan Shalev,
Washington Post,
29 Apr. 2026
There are many ways to mark life’s phases—biological development, achievements, simple chronological age.
—
Kelefa Sanneh,
New Yorker,
24 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
Examples are automatically compiled from online sources to
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Juergen Eckhardt,
Forbes.com,
23 June 2026
Whoop tracks long-term metrics like physiological age (which may differ from your chronological age) and your pace of aging.
—
Andrew Gebhart,
PC Magazine,
16 June 2026
Measured across multiple DNA methylation clocks, her biological age came in at an average of 17 to 23 years younger than her chronological age.
—
Allison Palmer,
Fort Worth Star-Telegram,
15 June 2026
An October 2025 study in the British Journal of Dermatology found women aged 40 to 50 who looked younger than their chronological age shared a more resilient skin microbiome.
—
Allison Palmer
updated June 13,
Miami Herald,
13 June 2026
One possibility is that GLP-1 drugs might be narrowing the gap between chronological age and biological age, the apparent age of various tissues.
—
Lori Youmshajekian,
Scientific American,
8 June 2026
Imagine receiving a test result that tells you your body is biologically five years older than your chronological age.
—
Idan Shalev,
Washington Post,
29 Apr. 2026
There are many ways to mark life’s phases—biological development, achievements, simple chronological age.
—
Kelefa Sanneh,
New Yorker,
24 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
Cite this Entry
“Chronological age.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chronological%20age. Accessed 25 Jun. 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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