Meaning of the word younger in English

What does younger mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

younger

US /ˈjʌŋ.ɡər/
UK /ˈjʌŋ.ɡər/

Adjective

having lived or existed for only a short time; not old

Example:
My younger sister is still in high school.
He looks much younger than his actual age.