Justin Timberlake is all for holding onto his youth in whichever way he can. On Tuesday, Timberlake appeared on the Ellen DeGeneres Show for the 24th time and revealed how he never grows out of his "childish" ways.

During the Burning Questions segment, DeGeneres, 64, asked him the question, "What did you think you would've grown out of by now but you still haven't?"

To that, the 41-year-old singer said, "the Ellen underwear you gave me." Timberlake was gifted a pair of boxer-briefs by the talk show host during her second episode ever in 2003, according to People.

After sharing a laugh together, the "Mirror" singer said that the one thing he hasn't really let go of is "being childish." DeGenerous then responded by saying, "Same with me," and "it's a good thing to stay young."

"Having kids, you get to see the world again through their eyes," the "SexyBack" singer said before proceeding to share a piece of "really good advice" someone had given him about being a parent to his two sons Phineas, 21 months, and Silas, 7, with wife Jessica Biel.

"Keep your kids as young as they can be for as long as possible. Don't let them grow up too fast," he said before mentioning that that is the secret to keeping himself young.

In Jan. 2021, Timberlake spoke to Dax Shepard about he and Biel had retreated from the public eye to give both their sons a chance at a normal upbringing, per E! Online.

"I try to be conscious of making sure we can live a life where we're not weirdly private but we're conscious of making sure they can be kids for as long as possible. And not have the weight of somebody else treating them differently because of something that their parents do," Timberlake shared.

Justin Timberlake
Justin Timberlake performs onstage during the 2018 iHeartRadio Music Festival at T-Mobile Arena on September 22, 2018 in Las Vegas, Nevada. Getty Images/Kevin Winter

The Tennessee native then added about how he worries his children will not be able to form true friendships because of his and his wife's line of work. "It's a lot to unpack," he said at the time.