| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 16-Feb-2018 | Dewi Cross | Wales | 06-Dec-1999 | 18(73) |
| 02-Dec-2017 | Will Jones | Wales | 03-Dec-1998 | 18(365) |
| 02-Sep-2017 | Keelan Giles | Wales | 29-Jan-1998 | 19(216) |
| 21-Apr-2018 | Dylan Moss | Wales | 08-Sep-1998 | 19(225) |
| 24-Feb-2018 | Reuben Morgan-Williams | Wales | 02-Feb-1998 | 20(22) |
| 21-Apr-2018 | Matthew Aubrey | Wales | 04-Jun-1997 | 20(321) |
| 27-Oct-2017 | Owen Watkin | Wales | 12-Oct-1996 | 21(15) |
| 22-Sep-2017 | Adam Beard | Wales | 07-Jan-1996 | 21(259) |
| 26-Nov-2017 | Joe Thomas | Wales | 21-Feb-1996 | 21(279) |
| 21-Apr-2018 | Ifan Phillips | Wales | 29-Jan-1996 | 22(83) |
| 02-Sep-2017 | Rory Thornton | Wales | 16-Mar-1995 | 22(171) |
| 21-Apr-2018 | Luke Price | Wales | 26-Sep-1995 | 22(208) |
| 04-Nov-2017 | Dafydd Howells | Wales | 22-Mar-1995 | 22(228) |
| 29-Sep-2017 | Scott Otten | Wales | 19-Jul-1994 | 23(72) |
| 02-Sep-2017 | Oliver Cracknell | Wales | 26-May-1994 | 23(99) |
| 22-Sep-2017 | Nicky Smith | Wales | 07-Apr-1994 | 23(168) |
| 09-Sep-2017 | Sam Davies | Wales | 06-Oct-1993 | 23(338) |
| 02-Dec-2017 | Gareth Thomas | Wales | 02-Aug-1993 | 24(122) |
| 02-Sep-2017 | Cory Allen | Wales | 11-Feb-1993 | 24(203) |
| 02-Sep-2017 | Dan Baker | Wales | 05-Jul-1992 | 25(59) |
| 27-Oct-2017 | Sam Cross | Wales | 26-Aug-1992 | 25(62) |
| 02-Sep-2017 | Tom Habberfield | Wales | 19-May-1992 | 25(106) |
| 02-Sep-2017 | Sam Parry | Wales | 17-Dec-1991 | 25(260) |
| 29-Sep-2017 | Jay Baker | Wales | 06-Oct-1991 | 25(359) |
| 02-Sep-2017 | Jeff Hassler | Canada | 21-Aug-1991 | 26(13) |
| 09-Feb-2018 | Rhodri Jones | Wales | 23-Dec-1991 | 26(49) |
| 02-Sep-2017 | Ben John | Wales | 28-Feb-1991 | 26(187) |
| 09-Sep-2017 | Lloyd Ashley | Wales | 02-Feb-1991 | 26(220) |
| 26-Nov-2017 | Hanno Dirksen | South Africa | 31-Mar-1991 | 26(241) |
| 09-Sep-2017 | James King | Wales | 24-Jul-1990 | 27(47) |
| 27-Oct-2017 | Ashley Beck | Wales | 15-Apr-1990 | 27(195) |
| 02-Sep-2017 | Ma'afu Fia | Tonga | 22-Nov-1989 | 27(284) |
| 29-Sep-2017 | Guy Mercer | England | 12-Dec-1989 | 27(291) |
| 22-Sep-2017 | Daniel Biggar | Wales | 16-Oct-1989 | 27(341) |
| 02-Sep-2017 | Justin Tipuric | Wales | 06-Aug-1989 | 28(27) |
| 22-Sep-2017 | Rhys Webb | Wales | 09-Dec-1988 | 28(287) |
| 02-Sep-2017 | Daniel Evans | Wales | 15-Nov-1988 | 28(291) |
| 27-Oct-2017 | Dimitri Arhip | Moldova | 12-Nov-1988 | 28(349) |
| 22-Sep-2017 | Scott Baldwin | Wales | 12-Jul-1988 | 29(72) |
| 09-Sep-2017 | Kieron Fonotia | Samoa | 02-Feb-1988 | 29(220) |
| 16-Sep-2017 | Dan Lydiatt | Wales | 18-Dec-1987 | 29(273) |
| 29-Sep-2017 | Alan Wyn Jones | Wales | 19-Sep-1985 | 32(10) |
| 04-Nov-2017 | Robert McCusker | Wales | 12-Oct-1985 | 32(23) |
| 02-Sep-2017 | James Hook | Wales | 27-Jun-1985 | 32(67) |
| 04-Nov-2017 | Brendon Leonard | New Zealand | 16-Apr-1985 | 32(202) |
| 02-Sep-2017 | Bradley Davies | Wales | 09-Jan-1985 | 32(236) |
| 21-Apr-2018 | Giorgi Nemsadze | Georgia | 26-Sep-1984 | 33(207) |
| 02-Sep-2017 | Paul James | Wales | 13-May-1982 | 35(113) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).