Let's make this birthday one to remember.

41 years old (Born on March 28, 1984)

Happy Birthday, Sylvia Kibet! You're still running circles around the competition—literally. Who could forget your incredible silver medal performances in the 5,000 meters at both the 2009 and 2011 World Championships? You made Kenya proud while leaving everyone else breathless (and probably wondering if you secretly had wings hidden somewhere).

As another year races by faster than a final lap sprint, we hope you're celebrating with cake that's as sweet as victory—and maybe even easier to catch up to. Keep inspiring us all with your determination and speed; after all these years, we're convinced you've discovered how to outrun aging itself!