| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 06-May-2017 | Taufa'ao Filise | Tonga | 26-May-1977 | 39(346) |
| 15-Apr-2017 | Gethin Jenkins | Wales | 17-Nov-1980 | 36(149) |
| 06-May-2017 | Matthew Rees | Wales | 09-Dec-1980 | 36(148) |
| 06-May-2017 | Nick Williams | New Zealand | 02-Dec-1983 | 33(156) |
| 06-May-2017 | Jarrad Hoeata | New Zealand | 12-Dec-1983 | 33(146) |
| 03-Dec-2016 | Josh Turnbull | Wales | 12-Mar-1984 | 32(266) |
| 06-May-2017 | Reynold Lee-lo | Samoa | 28-Feb-1986 | 31(67) |
| 28-Apr-2017 | Rhys Gill | Wales | 30-Oct-1986 | 30(181) |
| 07-Apr-2017 | George Earle | South Africa | 09-Jan-1987 | 30(89) |
| 04-Mar-2017 | Tom James | Wales | 17-Apr-1987 | 29(322) |
| 25-Mar-2017 | Anton Peikrishvili | Georgia | 18-Sep-1987 | 29(189) |
| 12-Feb-2017 | James Down | Wales | 29-Aug-1987 | 29(168) |
| 07-Apr-2017 | Blaine Scully | United States | 29-Feb-1988 | 29(38) |
| 07-Apr-2017 | Sam Warburton | Wales | 05-Oct-1988 | 28(184) |
| 28-Apr-2017 | Kristian Dacey | Wales | 25-Jul-1989 | 27(277) |
| 06-May-2017 | Lloyd Williams | Wales | 30-Nov-1989 | 27(157) |
| 26-Dec-2016 | Scott Andrews | Wales | 01-Aug-1989 | 27(147) |
| 06-May-2017 | Alex Cuthbert | Wales | 05-Apr-1990 | 27(31) |
| 06-May-2017 | Willis Halaholo | Wales | 06-Jul-1990 | 26(305) |
| 28-Oct-2016 | Cam Dolan | United States | 07-Mar-1990 | 26(236) |
| 28-Apr-2017 | Josh Navidi | Wales | 30-Dec-1990 | 26(120) |
| 06-May-2017 | Gareth Anscombe | Wales | 10-May-1991 | 25(362) |
| 25-Nov-2016 | Dan Fish | Wales | 19-Dec-1990 | 25(342) |
| 25-Mar-2017 | Steve Shingler | Wales | 20-Jun-1991 | 25(279) |
| 06-May-2017 | Macauley Cook | Wales | 31-Dec-1991 | 25(127) |
| 06-May-2017 | Matthew Morgan | Wales | 23-Apr-1992 | 25(13) |
| 28-Oct-2016 | Kirby Myhill | Wales | 05-Feb-1992 | 24(266) |
| 06-May-2017 | Ellis Jenkins | Wales | 29-Apr-1993 | 24(7) |
| 26-Dec-2016 | Cory Allen | Wales | 11-Feb-1993 | 23(318) |
| 06-May-2017 | Sion Bennett | Wales | 27-Nov-1993 | 23(160) |
| 28-Apr-2017 | Aled Summerhill | Wales | 02-Nov-1994 | 22(178) |
| 28-Apr-2017 | Tomos Williams | Wales | 01-Jan-1995 | 22(118) |
| 07-Oct-2016 | Garyn Smith | Wales | 12-Jul-1995 | 21(88) |
| 06-May-2017 | Corey Domachowski | Wales | 19-Sep-1996 | 20(229) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).