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.
Medical 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
- making common cause
- making do
- making ends meet
- making eyes
- making eyes (at)
- making eyes at
- making for
- making fun of
- making game of
- making good
- making good (for)
- making good for
- making iron
- making it
- making it (through)
- making it through
- making love
- making much of
- making noise
- making noises
- making of
- making off
- making off with
- making one's flesh creep
- making one's mark