He is six years 'junior' to me. = He is 'junior' to me by six years. [=he is six years younger than I am]
He is six years my 'junior'. [=he is six years younger than I am]
She is a 'junior' partner in the law firm.
(..) You got to listen to me, man. Who are you racing? Jesse, don't do it. I bet you he's got more than $ under the hood of that car. Too soon, junior. No! Shit! Oh, God! Yo! Heads up, bro. We got problems. - What? (..)2001 The Fast and the Furious