Let's make this birthday one to remember.

45 years old (Born on May 17, 1980)

Happy Birthday, Alistair "The Demolition Man" Overeem! Everyone remembers your unforgettable UFC debut back in September 2011, when you stormed into the octagon and made Brock Lesnar reconsider his career choices. His liver still winces a little each time your birthday comes around.

From dominating in kickboxing rings to thrilling fans with devastating knockouts, you've always lived up to your nickname. Wishing you another year just like your powerful knees—unstoppable and never aging. Keep punching through life's challenges as effortlessly as you do opponents in the cage—but maybe ease off the birthday cake punches. Enjoy your day, champ!