| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 15-Sep-2012 | Rhys Patchell | Wales | 17-May-1993 | 19(121) |
| 01-Sep-2012 | Harry Robinson | Wales | 16-Apr-1993 | 19(138) |
| 01-Sep-2012 | Thomas Davies | Wales | 10-Mar-1993 | 19(175) |
| 01-Sep-2012 | Lewis Jones | Wales | 24-Nov-1992 | 19(281) |
| 15-Feb-2013 | Thomas Young | Wales | 18-May-1992 | 20(273) |
| 02-Nov-2012 | Luke Hamilton | Scotland | 07-Jan-1992 | 20(300) |
| 25-Nov-2012 | Macauley Cook | Wales | 31-Dec-1991 | 20(330) |
| 25-Nov-2012 | Owen Williams | Wales | 02-Oct-1991 | 21(55) |
| 15-Sep-2012 | Tom Williams | Wales | 02-Apr-1991 | 21(167) |
| 01-Sep-2012 | Josh Navidi | Wales | 30-Dec-1990 | 21(246) |
| 01-Sep-2012 | Dan Fish | Wales | 19-Dec-1990 | 21(257) |
| 07-Sep-2012 | Alex Cuthbert | Wales | 05-Apr-1990 | 22(156) |
| 07-Sep-2012 | Rhys Williams | Wales | 16-Jan-1990 | 22(235) |
| 15-Sep-2012 | Lloyd Williams | Wales | 30-Nov-1989 | 22(290) |
| 27-Oct-2012 | Scott Andrews | Wales | 01-Aug-1989 | 23(87) |
| 28-Sep-2012 | Jason Tovey | Wales | 28-Apr-1989 | 23(153) |
| 22-Feb-2013 | Kristian Dacey | Wales | 25-Jul-1989 | 23(212) |
| 07-Sep-2012 | Leigh Halfpenny | Wales | 22-Dec-1988 | 23(259) |
| 01-Sep-2012 | Rory Watts Jones | England | 15-Dec-1988 | 23(260) |
| 07-Sep-2012 | Sam Warburton | Wales | 05-Oct-1988 | 23(337) |
| 30-Nov-2012 | Sam Hobbs | Wales | 13-May-1988 | 24(201) |
| 01-Sep-2012 | Robin Copeland | Ireland | 23-Oct-1987 | 24(314) |
| 01-Sep-2012 | James Down | Wales | 29-Aug-1987 | 25(4) |
| 22-Sep-2012 | Lou Reed | Wales | 10-Sep-1987 | 25(13) |
| 05-Jan-2013 | Richard Smith | Wales | 08-Nov-1987 | 25(59) |
| 23-Mar-2013 | Filo Paulo | Samoa | 06-Nov-1987 | 25(138) |
| 01-Sep-2012 | Tom James | Wales | 17-Apr-1987 | 25(138) |
| 15-Sep-2012 | Marc Breeze | Wales | 11-Feb-1987 | 25(217) |
| 22-Sep-2012 | Jamie Roberts | Wales | 08-Nov-1986 | 25(319) |
| 01-Mar-2013 | Alex Walker | Wales | 31-Jul-1986 | 26(214) |
| 01-Sep-2012 | Andries Pretorious | Wales | 26-Sep-1985 | 26(341) |
| 07-Sep-2012 | Daffyd Hewitt | Wales | 21-Aug-1985 | 27(17) |
| 22-Feb-2013 | Chris Czekaj | Wales | 14-Dec-1985 | 27(70) |
| 07-Sep-2012 | Benoit Bourrust | France | 16-Jun-1985 | 27(83) |
| 15-Sep-2012 | Nathan Trevett | Wales | 23-Mar-1985 | 27(176) |
| 30-Nov-2012 | Michael Paterson | New Zealand | 09-May-1985 | 27(205) |
| 07-Sep-2012 | Bradley Davies | Wales | 09-Jan-1985 | 27(241) |
| 06-Oct-2012 | Campese Ma'afu | Fiji | 19-Dec-1984 | 27(291) |
| 01-Sep-2012 | Gavin Evans | Wales | 18-Jul-1984 | 28(45) |
| 01-Sep-2012 | Gareth Davies | Wales | 02-Mar-1984 | 28(183) |
| 01-Sep-2012 | Andy Kyriacou | England | 04-Jan-1983 | 29(241) |
| 01-Sep-2012 | Ceri Sweeney | Wales | 21-Jan-1980 | 32(224) |
| 01-Sep-2012 | Taufa'ao Filise | Tonga | 26-May-1977 | 35(99) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).