If the teenagers are unruly in a public space, then they are a nuisance.
A nuisance of teenagers.
Teens in church are a pride.
A pride of teenagers.
Teens in school in various groups are cliques or gangs.
A teen clique.
Cliques are populated with teens who have similar characteristics or social attributions thus adding subcategories: freaks, emos(emotional disorders), larpers(those who dress in costume and act out Video Games or movies--see losers), posers (wannabes who can't), band slut and so on.
Gangs are dangerous versions of cliques. We do not discuss gangs so as not to draw their ire. Gangs wear colors and carry guns.
Teen girls who travel together wearing similar clothing and toothy smiles are pods. The individual girls are called bitches.
See that pod over there? They think they're, like, sooo hot. She's such a bitch.
As you can see, there is no singular term for teen groups. It is best to avoid them, thus relieving you of your need for such a term.
Friends.
Beryce W. MacLennan has written: 'Group counseling and psychotherapy with adolescents' -- subject(s): Counseling, Group Processes, Group counseling for teenagers, Group psychotherapy, Group psychotherapy for teenagers, In adolescence, Group Psychotherapy 'Group counseling and group psychotherapy with adolescents'
If you mean age group then the highest group of drug abuse is teenagers.
Teenagers
the age group is 3-12 highly not recommended for teenagers
Teenagers
Teenagers search the web for the same reasons any other age group does. They are looking for information.
A group, as a single entity, would be nominal.
The midnight society.
They are the most active and working group in Ghana...
Jeopardy!
because they are middle aged