Let's make this birthday one to remember.

43 years old (Born on August 15, 1981)

Happy Birthday, Brendan Hansen! You're the only guy we know who can proudly say he's spent most of his life mastering breaststroke without giggling. From your Olympic gold medals in Beijing 2008 and London 2012 medley relays to that impressive bronze medal swim in the individual 100-meter breaststroke at the London Games—your achievements have made waves (literally!) around the world.

Here's hoping this birthday brings you as much joy as standing atop an Olympic podium—or at least more cake than chlorine. Keep swimming strong, laughing often, and remember: age is just a number...but lap times are forever!