| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| An Se-Hyeon | SWI | 14 October 1995 | |
| Michael Andrew | SWI | 18 April 1999 | |
| Luke Bibby | SWI | 4 July 1995 | |
| Ilya Borodin | SWI | 14 February 2003 | |
| Bronte Campbell | SWI | 14 May 1994 | |
| Cate Campbell | SWI | 20 May 1992 | |
| Arianna Castiglioni | SWI | 15 August 1997 | |
| Darya Chikunova | SWI | 12 April 1999 | |
| Anton Chupkov | SWI | 22 February 1997 | |
| Michelle Coleman | SWI | 31 October 1993 | |
| Jhennifer Conceição | SWI | 13 June 1997 | |
| Ilya Druzhinin | SWI | 23 April 1998 | |
| Vladislav Grinev | SWI | 21 July 1996 | |
| Philip Heintz | SWI | 21 February 1991 | |
| Katinka Hosszú | SWI | 3 May 1989 | |
| Claudia Hufnagl | SWI | 20 May 1996 | |
| Zsu Jakabos | SWI | 3 April 1989 | |
| Jeong So-Eun | SWI | 5 April 1996 | |
| Marlene Kahler | SWI | 15 May 2001 | |
| Mariya Kameneva | SWI | 27 May 1999 | |
| Arno Kamminga | SWI | 22 October 1995 | |
| Kim Min-Suk | OWS/SWI | 4 April 2001 | |
| Kim U-Min | SWI | 24 August 2001 | |
| Yasuhiro Koseki | SWI | 14 March 1992 | |
| Aleksandr Krasnykh | SWI | 19 June 1995 | |
| Vladimir Kudryashov | SWI | 4 October 1996 | |
| Lee Ju-Ho | SWI | 23 January 1995 | |
| Felipe Lima | MOP/SWI | 5 April 1985 | |
| Maxim Lobanovszkij | SWI | 18 January 1996 | |
| Daniel Martin | SWI | 5 October 2000 | |
| Kaylee McKeown | SWI | 12 July 2001 | |
| Etiene Medeiros | SWI | 24 May 1991 | |
| Yukimi Moriyama | OWS/SWI | 9 August 1996 | |
| Vladimir Morozov | SWI | 16 June 1992 | |
| Darya Mullakayeva | SWI | 18 June 1998 | |
| Mun Jae-Gwon | SWI | 25 March 1998 | |
| Anton Nikitin | SWI | 24 August 2000 | |
| Jeanette Ottesen Gray | SWI | 30 December 1987 | |
| Jake Packard | SWI | 20 June 1994 | |
| Daniil Pakhomov | SWI | 5 August 1998 | |
| Yaroslav Potapov | OWS/SWI | 1 July 1999 | |
| Danas Rapšys | SWI | 21 May 1995 | |
| Valeriya Salamatina | SWI | 19 September 1998 | |
| Emily Seebohm | SWI | 5 June 1992 | |
| Maksym Shemberiev | SWI | 25 September 1993 | |
| Mikkayla Sheridan | SWI | 20 January 1995 | |
| Vitalina Simonova | SWI | 18 September 1992 | |
| Patrick Stäber | SWI | 2 June 1996 | |
| Keita Sunama | SWI | 8 May 1995 | |
| Arina Surkova | SWI | 17 July 1998 | |
| Szebasztián Szabó | FIN/SWI | 11 March 1996 | |
| Grigory Tarasevich | SWI | 1 August 1995 | |
| Mariya Temnikova | SWI | 17 November 1995 | |
| Kira Toussaint | SWI | 22 May 1994 | |
| Darya Ustinova | SWI | 29 August 1998 | |
| Darya Ustinova | SWI | 8 May 1998 | |
| Mikhail Vekovishchev | SWI | 5 August 1998 | |
| Sam Williamson | SWI | 19 December 1997 | |
| Yang Jae-Hun | SWI | 7 May 1998 | |
| Anna Yegorova | SWI | 31 May 1998 | |
| Petr Zhikharev | SWI | 9 October 1999 | |
| Andrey Zhilkin | SWI | 9 March 1995 | |
| Alina Zmushka | SWI | 5 January 1997 |