Let's make this birthday one to remember.

43 years old (Born on August 18, 1981)

Happy Birthday, Jan Frodeno! You're the only guy we know who celebrates birthdays by swimming miles, cycling mountains and running marathons—just for fun. Ever since your golden triumph at Beijing 2008 Olympics, you've been making triathlons look easier than blowing out birthday candles.

From Olympic gold to multiple Ironman World Championships victories in Kona—you've conquered it all with style (and sweat). Your relentless determination inspires us mere mortals lounging on our couches eating cake while watching you race!

Here's wishing another year of epic finishes and podium celebrations. May your energy stay endless—and may carbs always be plentiful!