Create an adorable and sporty birthday design celebrating a 40th birthday with a triathlon theme. Central to the image is a large, cute birthday cake. The cake's decorations cleverly incorporate elements of a triathlon: figures posed as swimmers decorate the top, miniature bicycles are lined along the frosting trails, and tiny runners encircle the cake's base. Above the cake are playful banners that read 'Happy 40th Triathlon'. Additionally, there are sprinkles of confetti in the shape of swim, bike, and run icons floating around, adding an athletic touch of whimsy to the overall scene.

Generated with these themes: Triathalon 40th.

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