Certain stars just know how to keep themselves from aging while others — for a variety of reasons — project an air of maturity beyond their years. Is it possible that Jason Segel is closer in age to Carly Rae Jepsen than Julianne Hough? In Hollywood, at least, age is in the eye of the beholder.
Adele, 24 1 of 16
Adele certainly sings like someone who's experienced a lifetime of heartbreak! And then there's her retro hair and makeup which makes her look like she's been plucked out of another era. The pumped-up ponytail look, especially. But the Grammy-winner, Oscar-winner, and new mom is only 24.
Jason Segel, 33 2 of 16
His love of The Muppets aside, I'd put Jason in the same age group as co-star Paul Rudd and the Judd Apatow crew. In other words, forty-something. Amazingly, he is in fact, 33.
Jennifer Lawrence, 22 3 of 16
She's been on the A-list ever since Winter's Bone. She's the face of The Hunger Games, one of the most successful books-to-movie franchises. After two Academy Award nominations and one win, it seems like Jennifer should be approaching her 30s, if not in them already... but she's 22!
Julianne Hough, 24 4 of 16
It was ages and ages ago that we saw her tangoing on Dancing With The Stars. Since it already seems as if Julianne's had multiple careers, I would have put the singer-dancer-actress and ex-girlfriend of Ryan Seacrest at 29 or 30. But she's 24!
Eminem, 40 5 of 16
Marshall Mathers III as he's formally known, has been married and divorced twice (to the same person-- Kim, his high school sweetheart and the subject of many of his songs). Daughter Hailie is 17. But STILL it's hard to believe Slim Shady is 40 years old.
Taylor Swift, 23 6 of 16
We've been hearing about her boyfriend struggles for so long! Plus the straight hair is a lot more sophisticated than the cutesy curls she used to favor. I'd put Taylor Swift somewhere close to 30... but she is 23
Alyson Hannigan, 39 7 of 16
The How I Met Your Mother star and mom of two could pass for a decade younger than her actual age... 39!
Justin Bieber, 19 8 of 16
The singing sensation went from a precocious kid to a 19 year-old who seems like he's 14. The tantrums, the monkey....
Carly Rae Jepsen, 27 9 of 16
When she came on the scene with "Call Me Maybe," and also maybe because her "mentor" is Justin Bieber, everyone assumed Carly Rae was a teenager herself. But the Canadian pop star is actually a decade older than many of her fans -- she's 27!
Cindy Crawford, 47 10 of 16
I venture to say that the supermodel looks better NOW at 47 than she did when we first met her. Those arms! That hair!
Halle Berry, 46 11 of 16
Much has been made about the fact that Halle is expecting her second child at 46. (She'll probably be 47 when he's born.) But how about the fact that she doesn't even look 36? I'd put her somewhere around 32 if I had to guess.
Harrison Ford, 71 12 of 16
Ruggedly handsome as ever -- Han Solo (as I will always think of him) is approaching his 8th decade. He's turning 71 this July which means he was 35-ish when Star Wars was released.
Miley Cyrus, 20 13 of 16
This is one of those cases where she's been famous for so long that it feels as if she should be a lot older than 20. But Miley was 13 years-old when she began filming Hannah Montana and 11 when she auditioned for the role!
Jared Leto, 41 14 of 16
Maybe you didn't know he had a band? Jared Leto, actor and frontman of 30 Seconds to Mars (that's the band's name) grabs the mic with the intensity and the wardrobe of a twenty-something rocker. He's 41.
Martha Stewart, 71 15 of 16
Before the whole domestic goddess thing, Martha started out as a model. She still looks pretty amazing today... at 71!
Salma Hayek, 47 16 of 16
Talk about bringing the glamour. At 47, the actor-producer always looks flawless. Not a wrinkle in sight!
Images courtesy of Pacific Coast News