| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 01-Apr-2017 | Taufa'ao Filise | Tonga | 26-May-1977 | 39(311) |
| 01-Apr-2017 | Gethin Jenkins | Wales | 17-Nov-1980 | 36(135) |
| 14-Jan-2017 | Matthew Rees | Wales | 09-Dec-1980 | 36(36) |
| 14-Jan-2017 | Nicky Robinson | Wales | 03-Jan-1982 | 35(12) |
| 01-Apr-2017 | Nick Williams | New Zealand | 02-Dec-1983 | 33(121) |
| 01-Apr-2017 | Jarrad Hoeata | New Zealand | 12-Dec-1983 | 33(111) |
| 21-Oct-2016 | Josh Turnbull | Wales | 12-Mar-1984 | 32(223) |
| 01-Apr-2017 | Reynold Lee-lo | Samoa | 28-Feb-1986 | 31(33) |
| 21-Jan-2017 | Rhys Gill | Wales | 30-Oct-1986 | 30(84) |
| 01-Apr-2017 | George Earle | South Africa | 09-Jan-1987 | 30(83) |
| 14-Oct-2016 | Tom James | Wales | 17-Apr-1987 | 29(181) |
| 14-Jan-2017 | James Down | Wales | 29-Aug-1987 | 29(139) |
| 21-Jan-2017 | Anton Peikrishvili | Georgia | 18-Sep-1987 | 29(126) |
| 01-Apr-2017 | Blaine Scully | United States | 29-Feb-1988 | 29(32) |
| 01-Apr-2017 | Sam Warburton | Wales | 05-Oct-1988 | 28(178) |
| 01-Apr-2017 | Kristian Dacey | Wales | 25-Jul-1989 | 27(250) |
| 01-Apr-2017 | Lloyd Williams | Wales | 30-Nov-1989 | 27(122) |
| 14-Oct-2016 | Scott Andrews | Wales | 01-Aug-1989 | 27(74) |
| 01-Apr-2017 | Alex Cuthbert | Wales | 05-Apr-1990 | 26(362) |
| 14-Jan-2017 | Willis Halaholo | Wales | 06-Jul-1990 | 26(193) |
| 01-Apr-2017 | Josh Navidi | Wales | 30-Dec-1990 | 26(93) |
| 01-Apr-2017 | Gareth Anscombe | Wales | 10-May-1991 | 25(327) |
| 21-Oct-2016 | Dan Fish | Wales | 19-Dec-1990 | 25(307) |
| 01-Apr-2017 | Steve Shingler | Wales | 20-Jun-1991 | 25(286) |
| 21-Jan-2017 | Macauley Cook | Wales | 31-Dec-1991 | 25(22) |
| 01-Apr-2017 | Matthew Morgan | Wales | 23-Apr-1992 | 24(343) |
| 15-Dec-2016 | Kirby Myhill | Wales | 05-Feb-1992 | 24(314) |
| 14-Jan-2017 | Cory Allen | Wales | 11-Feb-1993 | 23(337) |
| 21-Oct-2016 | Ellis Jenkins | Wales | 29-Apr-1993 | 23(175) |
| 14-Jan-2017 | Tomos Williams | Wales | 01-Jan-1995 | 22(14) |
| 21-Oct-2016 | Garyn Smith | Wales | 12-Jul-1995 | 21(102) |
| 10-Dec-2016 | Seb Davies | Wales | 15-May-1996 | 20(209) |
| 14-Jan-2017 | Corey Domachowski | Wales | 19-Sep-1996 | 20(117) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).