List of Famous people who are 31

Axel Domont is a French winemaker and former racing cyclist, who competed professionally between 2013 and 2020, entirely for UCI WorldTeam AG2R La Mondiale.

Mauricio Casillas Caballero is a Mexican male badminton player. In 2015, he represented IBM Mexico competed at the World Corporate Games in Mexico City, and won the men's singles and doubles event.

Rei Sato is a Japanese badminton player from the NTT East team. Born in Miyagi, he graduated from the Saitama Sakae high school, and later educated at the Nippon Sport Science University. He was part of the national junior team that won the bronze medal at the 2007 Asian Junior Championships. Teamed-up with Naomasa Senkyo, they won the men's doubles title at the North Shore City and Waikato International tournaments. Sato also clinched the men's singles title at the 2014 Portugal International tournament.

Sophie de Boer is a Dutch professional racing cyclist, who most recently rode for UCI Women's Continental Team Parkhotel Valkenburg.