Create a playful illustration that celebrates a 40th birthday with the theme of a triathlon. The centerpiece of the scene is a joyful number '40', sportily dressed with swim goggles, a bicycle helmet, and running shoes to symbolize the three segments of a triathlon. The number '40' is surrounded by a festive arrangement of balloons and streamers in a vibrant palette. Along the edges of the design, intersperse small caricatures of athletes, of different genders and descents such as Caucasian, Hispanic, Middle-Eastern, Black, and South Asian. These athletes should be engaged in swimming, cycling, and running, all rendered in a cartoon-like style to imbue the piece with energy and a sense of achievement.

Generated with these themes: Triathalon 40th.

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