1. Happy Birthday to my favorite sibling! Just kidding, you're my only sibling. Lucky you!
  2. Congrats on surviving another year of my fabulous company. You deserve a medal, not just a cake!
  3. Happy Birthday! Remember, you're not getting older; you're just upgrading your operating system.
  4. Another year older and wiser? Well, at least you've mastered the art of pretending to be an adult. Cheers!
  5. Wishing my sibling the most amazing birthday ever because, let's face it, you've had to put up with me all these years!
  6. Happy Birthday! You're not old; you're just a classic, like fine wine or a vintage video game.
  7. Congratulations on reaching the age where you wake up with the same level of excitement as finding a new condiment in the fridge. Hooray!
  8. Happy Birthday! May your day be as bright and joyful as the spotlight I always try to steal from you.
  9. Another year older means another year of pretending we're normal when our conversations are anything but. Happy Birthday, weirdo!
  10. Wishing you a birthday as fun and memorable as the time we convinced Mom that we were telepathic. Good times!
  11. Happy Birthday! May your day be filled with so much laughter that snorting becomes your default mode.
  12. Growing old is mandatory; growing up is optional. Thankfully, you've mastered the art of selective maturity. Happy Birthday!
  13. Happy Birthday, sibling! Today is the one day I won't remind you of all the embarrassing stories I know. Enjoy it while it lasts!
  14. Congrats on surviving another year of my brilliant ideas and reckless adventures. You deserve a medal, or at least a helmet!
  15. Happy Birthday! Remember, age is just a number, and in your case, it's a really big and impressive number!
  16. Another year, another wrinkle... I mean, opportunity for personal growth. Happy Birthday, oldie but goodie!
  17. Happy Birthday! May your day be filled with more cake than candles because, let's be honest, we're not getting any younger.
  18. Congrats on turning another year older and still managing to be the cooler sibling. It's a tough job, but someone has to do it!
  19. Wishing you a day as fantastic as the time we convinced our parents that we were aliens from a distant planet. Good times!
  20. Happy Birthday to the sibling who never fails to make me laugh, even if it's at their own expense. Here's to another year of hilarious moments!

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