Study the words that are connected with youth.
Adolescence - the period of time in a person's life when they are developing into an adult;
Delinquent - a person, usually young, who behaves in a way that is illegal or not acceptable to most people;
Grow up - to gradually become an adult;
Generation gap - a situation in which older and younger people do not understand each other because of their different experiences, opinions, habits, and behaviour;
Street/abandoned children - children left without care and protection;
Teenager - a young person between 13 and 19 years old;
Teen period - the period in which people are aged between 13 and 19;
Juvenile - relating to a young person who is not yet old enough to be considered an adult;
Youth - the period of your life when you are young, or the state of being young;
Youth organizations - a group of people who work with teens in an organized way for a shared purpose;
Youth leadership - the set of characteristics for young people that make them good leaders.

She had a troubled adolescence.

Taking responsibility for yourself is part of the process of growing up.

She's a young politician who manages to bridge/cross (= understand both groups in) the generation gap.

The magazine is aimed at teenagers and young adults.

I was a fairly good football player in my youth.