youthfulness, prime of manhood (supposed to be the state from sixteen to thirty-two), prime of life, youth

be in (one's) prime, be successful or at one's best

to produce aspiration and strength of youth (medicine)

youth to decline

evasive youth

state of youthfulness

the period of youth, puberty

after youth

intoxicated with youth

water bloom, deep green scum on stagnant water, thick layer of algae covering the surface of water

to talk like a youth in old age is like talking in a dream