*NSYNC’s JC Chasez debuts long gray hair in first TikTok

Wanna feel old?

*NSYNC alum JC Chasez just debuted a full head of gray hair in his first-ever TikTok.

The former boy band member, 46, showed off his long, silver tresses and matching facial hair in a video titled, “Am i doing this right?” which he posted Thursday.

Chasez went on to tag his former bandmates — Chris Kirkpatrick, 50, Lance Bass, 43, Justin Timberlake, 41, and Joey Fatone, 45 — all of whom have accounts on the Generation Z-skewed social media app.

“Wait, that’s really bright. Gimme this!” the former brunette said to the camera, which was being held by someone sitting next to him at a restaurant dinner table.

Chasez then grabbed the phone and held it up in front of him, striking a sensual pose for a brief moment.

“How’s this s—t work?” he asked before the screen went dark and “Bye, Bye, Bye” played in the background.

Though its production value was amateur at best, the 11-second video — and its star — were both big hits among fans.

“JC went from teen heartthrob to silver fox and I’m here for it. 🤍🦊,” one person commented, as someone else shouted, “ITS THE FACT THAT HE TAGGED ALL OF THE NSYNC GUYS FOR ME OMG.”

Another user rejoiced, “I would like to Thank Lance for getting all of NSYNC on Tiktok. We’ve won!!! 🥰.”

“This man has aged like fine wine,” remarked someone else, which prompted Chasez to wonder, “Red or white?”

One particularly moved fan asked, “Excuse the hell out of me. Is this real?! 😳🥺.”

“This I Promise You,” Chasez replied, making a cheeky reference to the band’s 2000 hit song.

When someone asked the musician, “Omg when did this happen?!” he revealed it was when choreographer Josh Beauchamp “took my phone and hit record.”

On behalf of millennials everywhere: Thank you, Josh.