adolescence; the period during which a person reaches sexual maturity, typically between ages 10 and 20

acne; pimples; skin condition common among teenagers where pores become blocked by oil or bacteria

To retain one's youthful vigor; to have eternal youth. Also written as [[永保青春|永保青春|yong3 bao3 qing1 chun1]].

to retain one's youthful vigor; to remain forever young (variant form)

acne or pimples common during puberty; colloquial variant of [[青春痘|青春痘|qing1 chun1 dou4]]

One will never be young again; used to emphasize making the most of one's opportunities while young.

the period of time in human development occurring just before the onset of puberty

to remain youthful forever; to keep one's youth perpetually