青春 (qīng chūn): 청년

Ten years after graduation, old classmates gathered together and looked through photos from back then, sighing that youth passes so quickly.

He devoted most of his youth to this band, singing from age eighteen all the way to thirty, and never regretted it.

Whenever she hears that old song, she thinks of her youth and those carefree days.

Teachers often tell students that youth is the most precious stage of life, and it should be used to learn knowledge and pursue dreams.

Although he is over fifty, he still maintains the vitality of youth, running and swimming every day.