What is wrong with "These youths, they come to me"? Is "Jugenlichen" specifically "Teenagers"?
My dictionary of choice says it's not. http://dict.leo.org/?search=jugendliche
In previous lessons youths or adolescents were accepted translations for Jugendliche. I think youths is exactly what Jugendliche means, teenager is more specific - 13-19 years old. Regardless, duolingo should be consistant!