Benedict Cumberbatch turned 40 on Tuesday.

Such a landmark age might be difficult to put to the uniquely handsome British actor, not least because of his relatively late start to superstardom – he didn’t become a global household name until 2010 when he took on the leading role in the BBC’s Sherlock.

Not only that, but he has an appearance that defies all signs of ageing, with barely a line upon his expressive face.

Birthday boy Benedict Cumberbatch turned 40 on July 19Birthday boy Benedict Cumberbatch turned 40 on July 19 (Anthony Devlin / PA Wire/Press Association Images)

The famously down-to-earth gent has achieved plenty in his 40 years on earth: he’s scored plenty of top roles in films such as 12 Years A Slave, The Hobbit: The Desolation Of Smaug and Tinker Tailor Soldier Spy, he’s been nominated for an Oscar for his role in The Imitation Game and also a handful of Baftas, he was made a CBE in 2015 and he’s also quite the cult icon on the internet. This year he also became a first-time father with his wife of just over one year, Sophie Hunter.

However, the British stage and screen star isn’t the only famous person whose age is quite the surprise.

Check out these other eight stars who are also 40 years old – whether you think they seem older or younger is up to you.

1. Kate Winslet

Kate Winslet was born October 5, 1975Kate Winslet was born October 5, 1975 (Ian West /PA)

Kate Winslet turned 40 on October 5 last year, and it’s fair to say the Oscar-winning actress has achieved more in her lifetime than just a youthful complexion and flawless style.

2. Kym Marsh

Kym Marsh celebrated her 40th birthday on June 13 2016Kym Marsh celebrated her 40th birthday on June 13 2016 (Matt Crossick/PA)

Is Kym Marsh really 40? The former Hear’Say singer – who rose to fame back in 2000 on reality series Popstars – is now best known for her role as Coronation Street’s Michelle Connor. It feels like she’s been around forever, far more than 16 years.

3. Emma Bunton

Emma Bunton was born on January 21, 1976Emma Bunton was born on January 21, 1976 (Ian West /PA)

Emma Bunton is the youngest of the Spice Girls, and the last one to turn 40. The bubbly blonde turned the milestone age in January this year, but looks every inch the Baby Spice we know and love from the 1990s.

4. Melissa Joan Hart

Melissa Joan Hart reached the milestone age of 40 on April 18Melissa Joan Hart reached the milestone age of 40 on April 18 (Michael Zorn / AP/Press Association Images)

For those who grew up watching 1990s TV, it will be a difficult pill to swallow to learn that Melissa Joan Hart is another 40-year-old star. The former Clarissa Explains It All and Sabrina The Teenage Witch actress is married with three children, but doesn’t look a day past her late 20s.

5. Colin Farrell

Colin Farrell was born on May 31, 1976Colin Farrell was born on May 31, 1976 (Jordan Strauss/AP/PA)

Colin Farrell is another “you won’t believe he’s 40″ celebrity. The ruggedly handsome and permanently bearded acting hunk celebrated his birthday on May 31.

6. Reese Witherspoon

Reese Witherspoon turned 40 on March 22 this yearReese Witherspoon turned 40 on March 22 this year (Evan Agostini / AP/Press Association Images)

It’s easy to look at 40-year-old Reese Witherspoon and still see her as the keen student in her iconic role from 1999 movie Election. Is it possible she has found the fountain of youth?

7. Isla Fisher

Unbelievably youthful Isla Fisher was born on February 3, 1976Unbelievably youthful Isla Fisher was born on February 3, 1976 (Jordan Strauss / AP/Press Association Images)

Red-haired and perennially angel-faced, Isla Fisher celebrated her 40th birthday on February 3 this year. We’ll have what she’s having please.

8. Anna Friel

Anna Friel turned 40 this month, on July 12Anna Friel turned 40 this month, on July 12 (Ian West/PA)

British acting stalwart Anna Friel is another new 40-year-old, having marked her birthday on July 12. Having become a national sensation back in the 1990s thanks to her role in soap Brookside, she has now gone on to achieve global fame thanks to her US TV hit series Pushing Daisies.