List of Famous people who are 40

Friedrich Mücke is a German actor who has appeared in more than twenty films since 2006, many of which have tackled issues relating to the former GDR.

Franziska Maria "Ska" Keller is a German politician and member of the European Parliament for the Germany constituency. She is a member of the Alliance '90/The Greens, part of the European Green Party.

Summer Lyn Glau is an American actress best known for her roles in science fiction and fantasy television series; as River Tam in Firefly (2002) and its continuation film Serenity (2005), as Tess Doerner in The 4400 (2005–2007), as Cameron in Terminator: The Sarah Connor Chronicles (2008–2009), as Bennett Halverson in Dollhouse (2009–2010), as Skylar Adams in Alphas (2011–2012) and as Isabel Rochev/Ravager in Arrow (2013–2014).

Émilie Dequenne is a Belgian actress. She first gained attention for playing the title character in the film Rosetta (1999), which earned her the Cannes Film Festival Award for Best Actress. She then went on to star in many films such as Brotherhood of the Wolf (2001), The Light (2004), The Girl on the Train (2009), Our Children (2012), Not My Type (2014) and This Is Our Land (2017).

Allison Blair Jones Rushing is an American attorney and jurist serving as a United States Circuit Judge of the United States Court of Appeals for the Fourth Circuit. She was nominated for the position by President Donald Trump in August 2018 and confirmed by the Senate in March 2019.

Vanessa Polster Bayer is an American actress and comedian. She is best known for being a cast member on Saturday Night Live from 2010 to 2017, which earned her an Emmy nomination. Bayer also appeared in films such as Trainwreck (2015), Office Christmas Party (2016), Carrie Pilby (2016), and Ibiza (2018).

Katsuhito Yokokume is a Japanese lawyer and former politician.

Cristobal Arreola is an American professional boxer who has challenged three times for the WBC heavyweight title. He was ranked by BoxRec as the world's No.8 heavyweight at the conclusion of 2007 and as No.7 heavyweight from 2008 to 2010.

David Brown Gilbert is an English professional snooker player. He is a former World Snooker Young Player of Distinction and practises in Tamworth, Staffordshire at Tamworth Cue Sports Leisure Club.

Robinson Stévenin is a French actor.