| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 08-May-2021 | Ken Owens | Wales | 03-Jan-1987 | 34(126) |
| 25-Apr-2021 | Marc Jones | Wales | 03-Apr-1987 | 34(23) |
| 15-May-2021 | Aaron Shingler | Wales | 07-Aug-1987 | 33(282) |
| 15-May-2021 | Jon Davies | Wales | 05-Apr-1988 | 33(40) |
| 15-May-2021 | Leigh Halfpenny | Wales | 22-Dec-1988 | 32(144) |
| 13-Jun-2021 | Uzair Cassiem | South Africa | 17-Mar-1990 | 31(88) |
| 15-May-2021 | Lewis Rawlins | Wales | 13-Apr-1990 | 31(33) |
| 15-May-2021 | Johnny McNicholl | Wales | 24-Sep-1990 | 30(234) |
| 13-Jun-2021 | Blade Thomson | Scotland | 04-Dec-1990 | 30(192) |
| 08-May-2021 | Jake Ball | Wales | 21-Jun-1991 | 29(322) |
| 15-May-2021 | Rob Evans | Wales | 14-Apr-1992 | 29(31) |
| 13-Jun-2021 | Steffan Hughes | Wales | 17-Feb-1994 | 27(116) |
| 13-Jun-2021 | Pieter Scholtz | South Africa | 20-Mar-1994 | 27(85) |
| 13-Jun-2021 | Steffan Evans | Wales | 01-Sep-1994 | 26(286) |
| 15-May-2021 | Angus O'Brien | Wales | 17-Sep-1994 | 26(241) |
| 15-May-2021 | Ed Kennedy | Australia | 19-Sep-1994 | 26(239) |
| 13-Jun-2021 | Josh Helps | Wales | 22-Dec-1994 | 26(174) |
| 13-Jun-2021 | Ryan Elias | Wales | 07-Jan-1995 | 26(158) |
| 15-May-2021 | Alex Jeffries | Wales | 27-Apr-1995 | 26(19) |
| 13-Jun-2021 | Tyler Morgan | Wales | 11-Sep-1995 | 25(276) |
| 13-Jun-2021 | Kieran Hardy | Wales | 30-Nov-1995 | 25(196) |
| 13-Jun-2021 | Daniel Jones | Wales | 07-Jan-1996 | 25(158) |
| 13-Jun-2021 | Steff Thomas | Wales | 27-Apr-1997 | 24(47) |
| 15-May-2021 | Ioan Nicholas | Wales | 03-Apr-1998 | 23(42) |
| 25-Apr-2021 | Dane Blacker | Wales | 06-Jul-1998 | 22(294) |
| 13-Jun-2021 | Tom Rogers | Wales | 17-Dec-1998 | 22(179) |
| 13-Jun-2021 | Ryan Conbeer | Wales | 05-Feb-1999 | 22(129) |
| 13-Jun-2021 | Morgan Jones | Wales | 23-May-1999 | 22(22) |
| 25-Apr-2021 | Iestyn Rees | Wales | 05-Oct-1999 | 21(203) |
| 13-Jun-2021 | Jac Morgan | Wales | 21-Jan-2000 | 21(144) |
| 25-Apr-2021 | Sam Costelow | Wales | 10-Jan-2001 | 20(105) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).