A youth is a person who is going to carry on what you have started. He is going to sit where you are sitting and, when you are gone, attend to those things which you think are important. You may adopt all the policies you please, but how they will be carried out depends on him. He will assume control of your cities, states, and nation. He is going to move in and take over your churches, schools, universities, and corporations. The fate of humanity is in his hands. So it might be well to pay him some attention.
-Unknown
Youth, early time of life, and metaphorically the optimism and innocence thought to accompany it. The nature of youthful experience is greatly affected by cultural and economic norms. The passage from youth to adulthood is frequently acknowledged by ritual formalities. Idealized youth is embodied in enduring themes of art and literature.
-Encarta, 2009.
Youth is the period between childhood and adulthood, described as the period of physical and psychological development from the onset of puberty to maturity and early adulthood. Definitions of the specific age range that constitutes youth vary. An individual's actual maturity may not correspond to their chronological age, as immature individuals exist at all ages.
-Wikipedia