| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Coleman Allen | SWI | 9 February 1993 | |
| Mariya Astashkina | SWI | 5 April 1999 | |
| Alia Atkinson | SWI | 11 December 1988 | |
| Kathleen Baker | SWI | 28 February 1997 | |
| Adam Barrett | SWI | 30 July 1992 | |
| Yelizaveta Bazarova | SWI | 28 November 1995 | |
| Elizabeth Beisel | SWI | 18 August 1992 | |
| Mireia Belmonte | OWS/SWI | 10 November 1990 | |
| Paul Biedermann | SWI | 7 August 1986 | |
| George Bovell | SWI | 18 July 1983 | |
| Myles Brown | SWI | 21 May 1992 | |
| Jazz Carlin | OWS/SWI | 17 September 1990 | |
| Marina Chan | SWI | 24 December 1997 | |
| Ryan Cochrane | SWI | 29 October 1988 | |
| Georgia Davies | SWI | 11 October 1990 | |
| Steffen Deibler | SWI | 10 July 1987 | |
| Inge Dekker | SWI | 18 August 1985 | |
| Christian Diener | SWI | 3 June 1993 | |
| Katie Drabot | SWI | 2 September 1997 | |
| Sergey Fesikov | SWI | 21 January 1989 | |
| Takeharu Fujimori | SWI | 17 February 1994 | |
| Eugene Godsoe | SWI | 20 January 1988 | |
| Sean Grieshop | SWI | 23 November 1998 | |
| Marieke Guehrer | SWI | 9 February 1986 | |
| James Guy | SWI | 26 November 1995 | |
| Dániel Gyurta | SWI | 4 May 1989 | |
| Gergely Gyurta | OWS/SWI | 12 September 1991 | |
| Fran Halsall | SWI | 12 April 1990 | |
| Franziska Hentke | SWI | 4 June 1989 | |
| Katinka Hosszú | SWI | 3 May 1989 | |
| Robert Hurley | SWI | 26 September 1988 | |
| Runa Imai | SWI | 15 August 2000 | |
| Masaki Kaneko | SWI | 27 March 1992 | |
| Lilly King | SWI | 10 February 1997 | |
| Aleksandr Krasnykh | SWI | 19 June 1995 | |
| Hannah Kukurugya | SWI | 20 July 1998 | |
| Chad le Clos | SWI | 12 April 1992 | |
| Flee Lee | SWI | 19 May 1992 | |
| Caitlin Leverenz | SWI | 26 February 1991 | |
| Amanda Lim | SWI | 8 January 1993 | |
| Kenneth Lim | SWI | 15 March 1993 | |
| David McKeon | SWI | 25 July 1992 | |
| Emma McKeon | SWI | 24 May 1994 | |
| Katie Meili | SWI | 16 April 1991 | |
| Rūta Meilutytė | SWI | 19 March 1997 | |
| Lukas Menkhoff | SWI | 24 December 1995 | |
| Siobhan-Marie O'Connor | SWI | 29 November 1995 | |
| Corey Okubo | SWI | 20 October 1995 | |
| Kevin Ong | SWI | 2 September 1998 | |
| Russell Ong | SWI | 14 April 1989 | |
| Miguel Ortiz-Cañavate | SWI | 19 February 1991 | |
| Patrick Ransford | SWI | 8 September 1996 | |
| Roland Schoeman | SWI | 3 July 1980 | |
| Daiya Seto | SWI | 24 May 1994 | |
| Velimir Stjepanović | SWI | 7 August 1993 | |
| Liam Tancock | SWI | 7 May 1985 | |
| Tao Li | SWI | 10 January 1990 | |
| Alex Valente | SWI | 1 May 1997 | |
| Chris Walker-Hebborn | SWI | 1 July 1990 | |
| Andrew Willis | SWI | 3 December 1990 |