noun

• (uncountable) The quality or state of being young.
  "Serene, smiling, enigmatic, she faced him with no fear whatever showing in her dark eyes. The clear light of the bright autumn morning had no terrors for youth and health like hers."
• (uncountable) The part of life following childhood; the period of existence preceding maturity or age; the whole early part of life, from childhood, or, sometimes, from infancy, to adulthood.
  "Make the most of your youth, it will not last forever."
• (countable) A young person.
  "There was a group of youths hanging around the parking lot, reading fashion magazines and listening to music."
• (countable) A young man; a male adolescent or young adult.
  "[…]and then a youth appeared—no one quite knew where from or to whom he belonged—but he settled down with them in a happy-go-lucky way, and they all lived together."