List of Famous people who are 40

Simon Brendle is a German mathematician working in differential geometry and nonlinear partial differential equations. He received his Dr. rer. nat. from Tübingen University under the supervision of Gerhard Huisken (2001). He was a professor at Stanford University (2005–2016), and is currently a professor at Columbia University. He has held visiting positions at MIT, ETH Zürich, Princeton University, and Cambridge University.

Kiichi Kunimoto is a Japanese professional mixed martial artist currently competing in the welterweight division of Bellator. A professional competitor since 2006, he has also competed for the RIZIN, UFC and Pancrase.

Edward Lau Kwok-fan, MH is a Hong Kong politician. He is the member of the executive committee of the Democratic Alliance for the Betterment and Progress of Hong Kong (DAB) and former member of the North District Council, representing Yan Shing until 2019. In the 2016 Hong Kong Legislative Council election, he succeeded DAB veteran legislator Ip Kwok-him in the District Council (First) functional constituency to the Legislative Council of Hong Kong.