Celebrities who are 40 years old

Katheryn Elizabeth Hudson (born October 25, 1984), known professionally as Katy Perry, is an American singer, songwriter and television personality. She is known for her influence on modern pop music and her camp style, being dubbed the "Queen of Camp" by Vogue and Rolling Stone. At 16, Perry released a gospel record titled Katy Hudson (2001) under Red Hill Records, which was commercially unsuccessful. She moved to Los Angeles at 17 to venture into secular music, and later adopted the stage name "Katy Perry" from her mother's maiden name. She recorded an album while signed to Columbia Records, but was dropped before signing to Capitol Records.

Cristiano Ronaldo dos Santos Aveiro GOIH ComM (Portuguese pronunciation: born 5 February 1985) is a Portuguese professional footballer who plays as a forward for Serie A club Juventus and captains the Portugal national team. Often considered the best player in the world and widely regarded as one of the greatest players of all time, Ronaldo has won five Ballon d'Or awards and four European Golden Shoes, the most by a European player. He has won 32 major trophies in his career, including seven league titles, five UEFA Champions Leagues, one UEFA European Championship, and one UEFA Nations League. Ronaldo holds the records for most goals (134) and assists (42) in the Champions League, most goals in the European Championship (14), and is tied with Ali Daei for most international goals (109). He is one of the few recorded players to have made over 1,100 professional career appearances, and has scored over 780 official senior career goals for club and country.

Scarlett Ingrid Johansson (born November 22, 1984) is an American actress and singer. The world's highest-paid actress in 2018 and 2019, she has been featured multiple times on the Forbes Celebrity 100 list. Time named her one of the 100 most influential people in the world in 2021. Johansson's films have grossed over $15.4 billion worldwide, making her the highest-grossing box office female star of all time. She has received various accolades, including a British Academy Film Award, a Tony Award, and nominations for two Academy Awards and five Golden Globe Awards.

Khloé Alexandra Kardashian (born June 27, 1984) is an American media personality, socialite, and model. Since 2007, she has starred with her family in the reality television series Keeping Up with the Kardashians. Its success has led to the creation of spin-offs, including Kourtney and Khloé Take Miami (2009–2013) and Kourtney and Khloé Take The Hamptons (2014–2015).

Marian Rivera Gracia-Dantes (Fil) or Marian Rivera Gracia de Dantes (Es) (née Spanish: Marian Gracia y Rivera; Filipino: Marian Rivera Gracia; born 12 August 1984) is a Spanish-Filipino commercial model and actress, best known for her roles in MariMar, Dyesebel, Amaya, and Temptation of Wife.

Tremaine Aldon Neverson (born November 28, 1984), better known as Trey Songz, is an American singer, songwriter, and actor. His debut album, I Gotta Make It, was released in 2005 through Atlantic Records. His follow-up album, Trey Day, spawned his first top 20 single, "Can't Help but Wait". Songz released his third album Ready in 2009 and a single from the album, "Say Aah", peaked at No. 9 on the Billboard Hot 100 making it Songz's first top 10 hit. Ready was nominated for Best Male R&B Vocal Performance at the 2008 Grammy Awards. The following year saw Songz's highest charting song to date, "Bottoms Up" featuring rapper Nicki Minaj from his fourth studio album, Passion, Pain & Pleasure.

Sir Lewis Carl Davidson Hamilton MBE HonFREng (born 7 January 1985) is a British racing driver currently competing in Formula One, driving for Mercedes. In Formula One, Hamilton has won a joint-record seven World Drivers' Championship titles (tied with Michael Schumacher), and holds the records for the most wins (103), pole positions (104), and podium finishes (196), among others.

Gemma Louise Atkinson (born 16 November 1984) is an English actress, radio presenter and former glamour model. She played Lisa Hunter on Hollyoaks (2001–2005) and on three spin-off series, Hollyoaks: After Hours (2004), Hollyoaks: Let Loose (2005) and Hollyoaks: In the City (2006), Tamzin Bayle on Casualty (2011–2012, 2014) and Carly Hope on Emmerdale (2015–2017). She current presents the drive time slot across the Hits Radio Network.

Avril Ramona Lavigne ( AV-ril lə-VEEN; born September 27, 1984) is a Canadian singer and songwriter. She is considered a key musician in the development of pop-punk music, as she paved the way for female-driven, punk-influenced pop music in the early 2000s. Her accolades include eight Grammy Awards nominations, among others.

Keira Christina Knightley OBE (born 26 March 1985) is a British actress. She has starred in both independent films and big-budget blockbusters, and is particularly noted for her roles in period dramas. Her accolades include two Empire Awards and nominations for two Academy Awards, two British Academy Film Awards, three Golden Globe Awards and one Laurence Olivier Award.