youth in WordNet English dictionary

1. an early period of development
   "during the youth of the project"
   youth  early days 
   
2. the freshness and vitality characteristic of a young person
   youth  youthfulness  juvenility 
   
3. a young person (especially a young man or boy)
   young person  youth  younker  spring chicken 
   
4. young people collectively
   "rock music appeals to the young"; "youth everywhere rises in revolt"
   young  youth 
   
5. early maturity; the state of being young or immature or inexperienced
   youth 
   
6. the time of life between childhood and maturity
   youth