| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Michael Andrew | SWI | 18 April 1999 | |
| Alia Atkinson | SWI | 11 December 1988 | |
| Carla Buchanan | SWI | 31 July 1995 | |
| Kyle Chalmers | SWI | 25 June 1998 | |
| Tommaso D'Orsogna | SWI | 29 December 1990 | |
| Stanislav Donets | SWI | 7 July 1983 | |
| Dong Jie | SWI | 31 October 1998 | |
| Brooke Forde | SWI | 4 March 1999 | |
| Takeharu Fujimori | SWI | 17 February 1994 | |
| Anya Goeders | SWI | 13 August 2000 | |
| Madeline Groves | SWI | 25 May 1995 | |
| Gergely Gyurta | OWS/SWI | 12 September 1991 | |
| Molly Hannis | SWI | 13 March 1992 | |
| Philip Heintz | SWI | 21 February 1991 | |
| Aliaksandra Herasimenia | SWI | 31 December 1985 | |
| Katinka Hosszú | SWI | 3 May 1989 | |
| Rikako Ikee | SWI | 4 July 2000 | |
| Kenta Ito | SWI | 26 October 1990 | |
| Zsu Jakabos | SWI | 3 April 1989 | |
| Masaki Kaneko | SWI | 27 March 1992 | |
| Rie Kaneto | SWI | 8 September 1988 | |
| Boglárka Kapás | SWI | 22 April 1993 | |
| Takeshi Kawamoto | SWI | 19 February 1995 | |
| Yuki Kobori | SWI | 25 November 1993 | |
| Marco Koch | SWI | 25 January 1990 | |
| Junya Koga | SWI | 19 July 1987 | |
| Mitch Larkin | SWI | 9 July 1993 | |
| Breeja Larson | SWI | 16 April 1992 | |
| Chad le Clos | SWI | 12 April 1992 | |
| Felipe Lima | MOP/SWI | 5 April 1985 | |
| Hayate Matsubara | SWI | 9 December 1991 | |
| Katsuhiro Matsumoto | SWI | 28 February 1997 | |
| Brayden McCarthy | SWI | 20 December 1997 | |
| Vladimir Morozov | SWI | 16 June 1992 | |
| Yui Ohashi | SWI | 18 October 1995 | |
| Koichiro Okazaki | SWI | 30 September 1986 | |
| Miguel Ortiz-Cañavate | SWI | 19 February 1991 | |
| Jeanette Ottesen Gray | SWI | 30 December 1987 | |
| Josh Prenot | SWI | 28 July 1993 | |
| Ben Proud | SWI | 21 September 1994 | |
| Mykhailo Romanchuk | OWS/SWI | 7 August 1996 | |
| Sharon van Rouwendaal | OWS/SWI | 9 September 1993 | |
| Masato Sakai | SWI | 6 June 1995 | |
| Paval Sankovich | SWI | 29 June 1990 | |
| Nick Schafer | SWI | 7 February 1992 | |
| Roland Schoeman | SWI | 3 July 1980 | |
| Emily Seebohm | SWI | 5 June 1992 | |
| Daiya Seto | SWI | 24 May 1994 | |
| Shinri Shioura | SWI | 26 November 1991 | |
| Nakiko Simizu | SWI | 1992 | |
| Satomi Suzuki | SWI | 29 January 1991 | |
| Yukihiro Takahashi | SWI | 17 January 1992 | |
| Miyuki Takemura | SWI | 25 July 1989 | |
| Miho Teramura | SWI | 27 September 1994 | |
| Darya Ustinova | SWI | 8 May 1998 | |
| Ippei Watanabe | SWI | 18 March 1997 | |
| Michelle Williams | SWI | 2 January 1991 | |
| Madi Wilson | SWI | 31 May 1994 | |
| Kelsi Worrell | SWI | 15 July 1994 | |
| Yoshiki Yamanaka | SWI | 16 June 1994 | |
| Yuliya Yefimova | SWI | 3 April 1992 | |
| Poul Zellmann | SWI | 2 September 1995 | |
| Daryna Zevina | SWI | 1 September 1994 |