Let's make this birthday one to remember.

55 years old (Born on September 19, 1969)

Happy Birthday, Kostya Tszyu! You're still knocking out birthdays like you knocked down opponents—swiftly and with style. From your unforgettable battles in the ring to becoming undisputed Light Welterweight Champion from 2001-2004, you've always packed a punch that left us cheering (and rivals reeling).

Even though gloves are hung up now, you're forever our champion of heart and humor. May this birthday be as legendary as your victories over Zab Judah or Julio César Chávez—and may no cake dare challenge you today! Keep bobbing through life’s punches gracefully; after all these years, you're still undefeated at being awesome.