He is junior than me. vs I am senior than him

Some examples from the web:

• This here is my wife, and that there is Junior.
• He is haughty to his juniors.
• Doctor, the thing is that Duke's life's... most important part is Junior.
• The silent participation is junior to both certificates.
• Alfred Rentman, white, junior.
• I've noticed something about Junior.
• He's a junior. I'm a junior.
• He is the musical director of Los Angeles Philharmonic, and is still the overall leader of Venezuela's junior orchestras.
• Hands off the vinyl, junior.
• This isn't some bank loan, junior.
• (clears throat) I do love Junior.
• I was trying to win those tickets for Junior.
• He left it to his son, Stephen Junior.
• You sounded really good today, Junior.
• - But you're a junior.
• - But you're a junior.
• Anyway, I apologize, Junior.
• He's just trying to scam us, Junior.
• I can't, because of Peter Junior.
• Long as I'm nowhere near Rick Junior.

Some examples from the web:

• I am Senior Undersecretary Dolores Jane Umbridge.
• He was the primary, more senior than me.
• I am senior counselor of the House of lyi, Kageyu Saito.
• No, she's more senior than me.
• I am the senior investigating officer on a double murder.
• I am all about managing time appropriately, especially for senior year.
• Even though I am a senior partner.
• "I am a senior government employee"in the intelligence community.
• I am Gunnery Sergeant Hartman, your senior drill instructor.
• I am Gunnery Sergeant Hartman, your senior drill instructor.
• Commander, I am the senior convening authority present.
• I am the Senior Mission Commander and I am leading this team.
• This is my senior year, and as long as I am captain, I am not about to lose this squad because we are all fighting over the same guys.
• As class president, I am responsible for the senior sleepover, which is just two nights away.
• Then, I am doing community service at the Orson Senior Center cutting up meat for old people.
• I am here as one of the more senior D-jocks at this station.
• And here I am, before lunch on my first day of my senior year.
• Seska, I am a senior officer now. I have responsibilities.
• I am inviting senior officers for a dinner
• I am pleased that it has been possible to reach a compromise on the senior appointments at Europol.