| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 12-Jan-2019 | Ken Owens | Wales | 03-Jan-1987 | 32(9) |
| 19-Jan-2019 | Hadleigh Parkes | Wales | 05-Oct-1987 | 31(107) |
| 12-Jan-2019 | Kieron Fonotia | Samoa | 02-Feb-1988 | 30(345) |
| 19-Jan-2019 | Jon Davies | Wales | 05-Apr-1988 | 30(289) |
| 19-Oct-2018 | Leigh Halfpenny | Wales | 22-Dec-1988 | 29(301) |
| 19-Jan-2019 | David Bulbring | South Africa | 12-Sep-1989 | 29(129) |
| 14-Dec-2018 | Uzair Cassiem | South Africa | 17-Mar-1990 | 28(272) |
| 14-Dec-2018 | Lewis Rawlins | Wales | 13-Apr-1990 | 28(245) |
| 19-Jan-2019 | Gareth Davies | Wales | 18-Aug-1990 | 28(154) |
| 19-Jan-2019 | Johnny McNicholl | Wales | 24-Sep-1990 | 28(117) |
| 07-Dec-2018 | James Davies | Wales | 25-Oct-1990 | 28(43) |
| 19-Oct-2018 | Blade Thomson | Scotland | 04-Dec-1990 | 27(319) |
| 14-Dec-2018 | Jake Ball | Wales | 21-Jun-1991 | 27(176) |
| 19-Jan-2019 | Tom Prydie | Wales | 23-Feb-1992 | 26(331) |
| 14-Dec-2018 | Wyn Jones | Wales | 26-Feb-1992 | 26(292) |
| 19-Jan-2019 | Rob Evans | Wales | 14-Apr-1992 | 26(280) |
| 19-Jan-2019 | Samson Lee | Wales | 30-Nov-1992 | 26(50) |
| 19-Oct-2018 | Tom Price | England | 22-Jan-1993 | 25(270) |
| 14-Dec-2018 | Rhys Patchell | Wales | 17-May-1993 | 25(211) |
| 12-Jan-2019 | Paul Asquith | Australia | 08-Dec-1993 | 25(35) |
| 19-Jan-2019 | Steffan Evans | Wales | 01-Sep-1994 | 24(140) |
| 19-Jan-2019 | Ed Kennedy | Australia | 19-Sep-1994 | 24(122) |
| 19-Jan-2019 | Josh Helps | Wales | 22-Dec-1994 | 24(28) |
| 13-Oct-2018 | Angus O'Brien | Wales | 17-Sep-1994 | 24(26) |
| 19-Jan-2019 | Ryan Elias | Wales | 07-Jan-1995 | 24(12) |
| 14-Dec-2018 | Will Boyde | Wales | 15-Dec-1994 | 23(364) |
| 19-Jan-2019 | Daniel Jones | Wales | 07-Jan-1996 | 23(12) |
| 19-Jan-2019 | Josh Macleod | Wales | 27-Oct-1996 | 22(84) |
| 19-Oct-2018 | Ioan Nicholas | Wales | 03-Apr-1998 | 20(199) |
| 19-Jan-2019 | Dan Davis | Wales | 17-Sep-1998 | 20(124) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).