Sign is related to Traffic. Traffic is related to Noise. Noise is related to Yell. you would Yell because Angry. 
Old is related to Senior. Senior is the opposite of Junior. 
Sign <--RelatedTo--> Traffic <--RelatedTo--> Noise <--RelatedTo--> Yell --MotivatedByGoal--> Angry 
Old <--RelatedTo--> Senior <--Antonym--> Junior 