54 years old (Born on February 26, 1971)
Happy Birthday, Max Martin! Just like your timeless hits from the '90s, you're officially legendary—and yet mysteriously ageless. Are you sure your secret isn't hidden somewhere between "Baby One More Time" and "I Want It That Way"? Seriously, even Backstreet Boys couldn't resist asking you repeatedly how you've managed to keep hitting all these chart-toppers.From defining pop music nostalgia with Britney's catchy melodies to recently crafting contemporary hits for artists who weren't even born when we first sang along to your masterpieces—it's clear you haven't lost your magic touch. Here's wishing a songwriter whose catchy choruses refuse to age as gracefully as he does the very happiest of birthdays. Keep those earworms coming!