This is the 7406th most frequent Korean word.
청년을
"청년을" means "youth" or "young person" (accusative form).
청년을 functions as the object in the sentence, receiving the action of 'respect'.
저는 그 청년을 존경합니다.
I respect that young man.
청년을 is used to specify the target audience for the seminar.
청년을 대상으로 채용 설명회를 개최했습니다.
We held a recruitment seminar targeting young people.
청년을 is the object of the action 'met and talked with'.