(n): a young person, not fully developed
(n): young people collectively
(n): a group of people having approximately the same age
(n): the time of life between childhood and maturity
(n): a period of time during which a person is normally in a particular life state
(n): early maturity; the state of being young or immature or inexperienced
(n): state of being mature; full development
(n): an early period of development
(n): an amount of time
(n): the freshness and vitality characteristic of a young person
(n): the opposite of oldness
'"Why should I laugh?" asked the old man. "Madness is youth is true wisdom."' -from the fairy tale The Enchanted Canary, in Andrew Lang's Red Fairy Book