Youth is a synonym of Teen. Teen is a synonym of Adolescent. Adolescent is a synonym of Teenager. you are likely to find Teenager in/at/on Mall. 
Reach entails/necessarily involves Travel. Reach is the opposite of Miss. Miss is the opposite of Strike. 
Youth <--Synonym--> Teen <--Synonym--> Adolescent <--Synonym--> Teenager --AtLocation--> Mall 
Travel <--Entails-- Reach <--Antonym--> Miss <--Antonym--> Strike 