It's official: Justin Timberlake really is returning to music in 2013, after a seven-year absence. But while Timberlake was exploring the world of Hollywood and dipping his toe into venture capitalism , an entire new generation of musicians came up, inspired by JT's own silky-smooth grooves. September 12, 2006—the day FutureSex/LoveSounds dropped—might not seem that long ago to you, but for these stars, it was almost an entire lifetime. Here's how old today's hottest young pop idols were the last time Justin Timberlake released an album:

HARRY STYLES:

12 years, seven months old.

 

JUSTIN BIEBER

12 years, six months old.

 

FIFTH HARMONY

13 years (Ally), 10 years (Normani and Lauren) and nine years (Camila and Dinah) old.

CHIEF KEEF

11 years and one month old.

 

AUSTIN MAHONE

10 years, 5 months old.

 

CODY SIMPSON

Nine years and nine months old.

 

WILLOW SMITH

Five years old.

Kids: They grow up so fast!