List of Famous people who are 40

Marie Elizabeth Harf is a liberal political commentator for the Fox News Channel and former deputy campaign manager for policy and communications for the Rep. Seth Moulton (D-Mass.) presidential campaign. She served as the Senior advisor of Strategic Communications to U.S. Secretary of State John Kerry at the United States Department of State, leading the Iran nuclear negotiations communications strategy. Harf also was Acting Spokesperson and Deputy Spokesperson of the State Department.

Liam Thomas Garrigan is an English actor. As a youth he attended classes at Kingston upon Hull's Northern Stage Company and was a student at Wyke College, Kingston upon Hull. His first television role was as Nic Yorke in the BBC continuing drama series Holby City. He is best known for his roles as Ian Al-Harazi on the Fox series 24: Live Another Day and King Arthur in the ABC series Once Upon a Time and Transformers: The Last Knight. He also provides the voice for Captain Kurt in the role-playing game GreedFall.

Josephine Decker is an American actress, filmmaker, and performance artist. As of 2020 she has directed four feature films: the experimental psychological thriller Butter on the Latch (2013), the experimental erotic thriller Thou Wast Mild and Lovely (2014), the experimental drama Madeline's Madeline (2018), and the semi-biographical thriller Shirley (2020). She also co-directed the documentary Bi the Way (2008) with Brittany Blockman.

Karin Hanczewski is a German actress.

Kazuo Inoue is a Japanese former professional racing cyclist. He finished second in the Japanese National Road Race Championships in 2008 and 2014, and represented Japan in the 2008 UCI Road World Championships. He has won the elite road race competition at the National Sports Festival of Japan four times.