Paul Rudd, who turns 53 this year, is famous for his youthful looks.
He's looked the same since his "Clueless" days. More recently, he played Ant-Man in Marvel's blockbuster "Avengers" franchise.
Rihanna was a teenager when her first single came out, and she looks like she hasn't aged a day.
At 17, Rihanna released her first album, "Music of the Sun," and it sold 2 million copies. Since then, the musician has released several chart-toppers like "Umbrella," "Take a Bow," "Disturbia," and "We Found Love."
It is impossible to believe that Daniel Dae Kim is 53.
He essentially had to wear glasses to show that time has passed from his "Lost" days.
Bianca Lawson somehow looks younger now than in 2003.
Lawson, now 43, played a high-schooler in season two of "Buffy the Vampire Slayer" in 1997 and 1998. Twelve years later, she played a high-schooler again in "Pretty Little Liars." Both times were equally believable.
In 2000, Beyoncé was 19 and in Destiny's Child. Today, she's 40 and still looking great.
Twenty years after Destiny's Child, Beyoncé is a Grammy-winning solo musician, feminist icon, and mother of three children: Blue, Sir, and Rumi.
Beyoncé's husband, Jay-Z, also does not seem to age.
In 2000, the rapper was 31, and now he is 52 years old.
Adam Levine is 43 years old, but he certainly doesn't look it.
Levine's band, Maroon 5, came out with their first album in 2002. It wasn't until 2004 that the musician and his band became popular for songs like "She Will Be Loved." He was famously a judge on "The Voice" for 16 seasons, though he left in 2019.
Over 20 years ago, 17-year-old Mila Kunis was on "That '70s Show."
The actress is now 38 years old and is married to her fellow "That '70s Show" actor, Ashton Kutcher. They have two kids.
"Mulan" star Gong Li looks exactly the same in 2000 and 2021.
Li, who played a new villain in the "Mulan" live-action remake, is 56 years old.
In 2000, Usher was 22, and he still looks like he's in his 20s today.
Today, Usher is 43, and he's still producing music.
Two decades ago, Will Smith was 34.
The 53-year-old recently won his first Oscar for his role in "King Richard," a feat that was overshadowed by his altercation with comedian Chris Rock.
Jennifer Aniston, 53, doesn't look much older than she did while starring on "Friends."
Most recently, Aniston was nominated for a Golden Globe for her role in Apple's "The Morning Show."
Joseph Gordon-Levitt is 41 years old, but he doesn't look a day over 25.
In 2000, the actor was 19 years old and appearing in movies like "Picking Up the Pieces" and "Forever Lulu." Today, he is 41 years old and playing former Uber CEO Travis Kalanick in the Showtime series "Super Pumped."
Although Jamie Foxx is middle-aged, he still looks as young as he did in 2000.
In 2000, the actor was 33 years old and acting in his own series, "The Jamie Foxx Show." Today, he's 54 and still a popular actor, and recently appeared in the highest-grossing film of 2021, "Spider-Man: No Way Home."
Jennifer Lopez is 52 but looks like she's barely aged in the past 20 years.
It's practically unbelievable how little J-Lo has aged in the past two decades, and that she's already turned the big 5-0, and 2 years ago, at that.
Actress Halle Berry turned 55 last year.
You can learn about how she stays in shape here.
Jared Leto doesn't look a day over 25. He's actually 50.
Here's how he transformed from art-school dropout into superhero movie star. Most recently, he joined the Sony Spider-Man universe with "Morbius."
Keira Knightley has looked the same since her "Pirates of the Caribbean" days.
Would you believe that Knightley is 37? That means she was just 18 when she starred as Elizabeth for the first time in 2003.
Mario Lopez is 48 but looks just as young as he did on "Saved by the Bell."
He's still close with the Zack to his A.C., Mark-Paul Gosselaar. In fact, they both reprised their roles in the "Saved by the Bell" revival.
Sandra Bullock definitely doesn't look 57.
Bullock made her big-screen return after a few Netflix movies with the adventure comedy "The Lost City" alongside Channing Tatum.
Singer Pharrell Williams, 49, is another celeb who never ages.
He doesn't look like he's aged a day.
How could Eva Mendes, 48, look the same in two photos taken 17 years apart?
Her husband, Ryan Gosling, is similarly ageless.
Aside from the salt-and-pepper beard, Idris Elba, 49, is unchanged.
The former Sexiest Man Alive performed at Coachella in 2019 as a DJ.
Would you believe that Ming-Na Wen is 58?
Wen keeps it in the Disney family — she was the speaking voice in the original "Mulan" in 1998, played Melinda May for seven years in the Marvel series "Agents of S.H.I.E.L.D.," and now is part of the "Star Wars" universe as bounty hunter Fennec Shand.
William Shatner almost looks younger now than he did in the early 2000s. He's currently 91 years old.
The nonagenarian is best known for his role as Captain James T. Kirk across various pieces of "Star Trek" lore. He became the oldest person to fly into space in 2021.
Gabrielle Union is radiant at age 49.
Union welcomed her first child with her husband, NBA star Dwyane Wade, in 2018.
Gwen Stefani was just 22 when her band No Doubt got a record deal. She's still performing today at 52.
Stefani married former Sexiest Man Alive Blake Shelton last summer. She wore two wedding dresses, including a Vera Wang bridal minidress with stiletto cowboy boots.
It's hard to believe that Elijah Wood is 41 years old.
He'll always be Frodo to us.
Wood's "Lord of the Rings" cast-mate, Liv Tyler, has also barely aged. She's now 44.
She also looks just like her dad, Aerosmith frontman Steven Tyler.
Tyra Banks, now 48, looked the same a quarter of a century ago.
When Banks reprised her 2000 "Life-Size" role in the 2018 sequel, it was like no time had passed.
Andrew Garfield actually looks better with age.
The "Spider-Man: No Way Home" star is somehow 38 years old — he barely looks like he's aged since he first played teenager Peter Parker 10 years ago in "The Amazing Spider-Man."
Busy Philipps, 42, has barely changed since her "Freaks and Geeks" days.
She was just 20 years old when she appeared in the cult classic.
Reese Witherspoon, 46, could still pass as her old character Elle Woods.
In fact, she's reprising her role as Elle in the upcoming "Legally Blonde" sequel.
Many things may change, but Snoop Dogg remains the same.
The rapper celebrated his 50th birthday in 2021.
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