What is the meaning of youth?

noun

• A young person (especially a young man or boy.
  • synonyms: young person, younker, spring chicken
• Young people collectively.
  • usage: "rock music appeals to the young"; "youth everywhere rises in revolt"
  • synonyms: young
• The time of life between childhood and maturity.
• Early maturity; the state of being young or immature or inexperienced.
• An early period of development.
  • usage: "during the youth of the project"
  • synonyms: early days
• The freshness and vitality characteristic of a young person.
  • synonyms: youthfulness, juvenility