Congratulations on turning 21, Neo! You'll be legal to do things you probably don't care to do anyway. :P

Try not to stress about the interview. Show that you can be calm and resourceful and concientious- best of luck! (Although fair warning: I don't know how Target's interviews for working in the store are, but their interviews for internships were brutal. If that happens to be the case here, take it with a grain of salt and know it's not you- it's them and it's a reason I'm not totally gung-ho about Target anymore- although I definitely prefer them to Walmart.)