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
Whoop tracks long-term metrics like physiological age (which may differ from your chronological age) and your pace of aging.
—
Andrew Gebhart, PC Magazine, 8 May 2026
The researchers looked specifically at the participants’ scores on four epigenetic clocks—essentially, these are markers on DNA that change with age, giving an estimate of the biological age of a tissue or individual that may or may not match a person’s chronological age.
—Claire Cameron, Scientific American, 7 May 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
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
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Andrew Gebhart, PC Magazine, 8 May 2026
The researchers looked specifically at the participants’ scores on four epigenetic clocks—essentially, these are markers on DNA that change with age, giving an estimate of the biological age of a tissue or individual that may or may not match a person’s chronological age.
—Claire Cameron, Scientific American, 7 May 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
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
Cite this Entry
“Chronological age.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chronological%20age. Accessed 22 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
Love words? Need even more definitions?
Merriam-Webster unabridged
