List of Famous people who are 40

Szymon Piotr Kołecki is a former Olympic Champion Polish weightlifter and current mixed martial artist. He was the silver medalist at the 2000 Olympic Games in Sydney and a gold medalist at the 2008 Olympic Games in Beijing, both in the 94 kg categories.

Nicole Perlman is an American screenwriter, best known for co-writing the Marvel Cinematic Universe film Guardians of the Galaxy (2014), and the story for Marvel's Captain Marvel (2019), and for Pokémon Detective Pikachu (2019).

Matej Mugerli is a Slovenian professional road bicycle racer, who currently rides for UCI Continental team SPORT.LAND. Niederösterreich.

Katarina Martinson is a Swedish billionaire businesswoman. She owns 14% of L E Lundbergforetagen, the family holding company, which owns property, pulp and paper companies, and was founded by her grandfather Lars Erik Lundberg.

Joseph Gebbia Jr. is an American billionaire designer and Internet entrepreneur. He is a co-founder and chief product officer (CPO) of Airbnb. In 2009, Gebbia was listed in BusinessWeek's Top 20 Best Young Tech Entrepreneurs. In 2010, he was named in Inc. Magazine's Thirty under Thirty, and 2013, he was named in Fortune Magazine's Forty-under-Forty.

Viola Priesemann is a German physicist. One of her research priorities is to explore how the human brain organizes its neuronal capacities, to enable meaningful information processing.

Sergei Nikolayevich Novitski is a Russian former competitive ice dancer. He skated with Jana Khokhlova until April 2010. Together, they are the 2008 World bronze medalists, 2009 European champions, and two-time (2008–09) Russian national champions.

Sven Vanthourenhout is a Belgian cycling coach and former professional racing cyclist, primarily riding cyclo-cross. Since 2017, Vanthourenhout has been the coach of the Belgian national cyclo-cross team, and in 2020 became the coach of the national road cycling team as well.

Helen Nichol is a female badminton player from Canada, who won the gold medal in the women's doubles competition at the 2003 Pan American Games, partnering Charmaine Reid.