| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 26-Oct-2012 | JJ Hanrahan | Ireland | 27-Jul-1992 | 20(91) |
| 01-Sep-2012 | Patrick Butler | Ireland | 01-Dec-1990 | 21(275) |
| 01-Sep-2012 | Luke O'Dea | Ireland | 18-Jul-1990 | 22(46) |
| 22-Sep-2012 | Simon Zebo | Ireland | 16-Mar-1990 | 22(191) |
| 07-Sep-2012 | Dave O'Callaghan | Ireland | 12-Jan-1990 | 22(239) |
| 01-Dec-2012 | CJ Stander | Ireland | 05-Apr-1990 | 22(241) |
| 01-Sep-2012 | Sean Dougall | Ireland | 28-Oct-1989 | 22(309) |
| 06-Oct-2012 | Peter O'Mahony | Ireland | 17-Sep-1989 | 23(19) |
| 09-Feb-2013 | Danny Barnes | Ireland | 07-Oct-1989 | 23(125) |
| 29-Sep-2012 | Conor Murray | Ireland | 20-Apr-1989 | 23(162) |
| 14-Sep-2012 | Dave Kilcoyne | Ireland | 14-Dec-1988 | 23(274) |
| 19-Apr-2013 | Ronan O'Mahony | Ireland | 28-May-1989 | 23(326) |
| 25-Nov-2012 | Ian Nagle | Ireland | 17-Oct-1988 | 24(39) |
| 22-Sep-2012 | Mike Sherry | Ireland | 18-Jun-1988 | 24(96) |
| 02-Mar-2013 | Cathal Sheridan | Ireland | 14-Nov-1988 | 24(108) |
| 02-Nov-2012 | David Foley | Ireland | 16-May-1988 | 24(170) |
| 07-Sep-2012 | Stephen Archer | Ireland | 29-Jan-1988 | 24(222) |
| 03-May-2013 | John Ryan | Ireland | 02-Aug-1988 | 24(274) |
| 22-Sep-2012 | Keith Earls | Ireland | 02-Oct-1987 | 24(356) |
| 26-Oct-2012 | Felix Jones | Ireland | 15-Aug-1987 | 25(73) |
| 29-Sep-2012 | Tommy O'Donnell | Ireland | 21-May-1987 | 25(132) |
| 01-Sep-2012 | Ian Keatley | Ireland | 01-Apr-1987 | 25(154) |
| 09-Feb-2013 | Ivan Dineen | Scotland | 05-Jul-1987 | 25(220) |
| 01-Sep-2012 | Duncan Williams | Ireland | 17-Apr-1986 | 26(138) |
| 01-Sep-2012 | Billy Holland | Ireland | 03-Aug-1985 | 27(29) |
| 22-Dec-2012 | Johne Murphy | Ireland | 10-Nov-1984 | 28(42) |
| 01-Sep-2012 | Dennis Hurley | Ireland | 15-Jul-1984 | 28(48) |
| 06-Oct-2012 | Donnacha Ryan | Ireland | 11-Dec-1983 | 28(300) |
| 01-Sep-2012 | Damian Varley | Ireland | 29-Oct-1983 | 28(308) |
| 01-Sep-2012 | Wian du Preez | South Africa | 30-Oct-1982 | 29(307) |
| 22-Sep-2012 | Niall Ronan | Ireland | 14-Sep-1982 | 30(9) |
| 01-Sep-2012 | Casey Laulala | New Zealand | 03-May-1982 | 30(122) |
| 01-Sep-2012 | James Downey | Ireland | 23-Mar-1981 | 31(162) |
| 01-Sep-2012 | James Coughlan | Ireland | 09-Dec-1980 | 31(266) |
| 01-Sep-2012 | BJ Botha | South Africa | 04-Jan-1980 | 32(241) |
| 23-Mar-2013 | Paul O'Connell | Ireland | 20-Oct-1979 | 33(155) |
| 01-Sep-2012 | Donncha O'Callaghan | Ireland | 24-Mar-1979 | 33(162) |
| 01-Sep-2012 | Doug Howlett | New Zealand | 21-Sep-1978 | 33(346) |
| 22-Sep-2012 | Peter Stringer | Ireland | 13-Dec-1977 | 34(284) |
| 22-Sep-2012 | Marcus Horan | Ireland | 07-Sep-1977 | 35(16) |
| 22-Sep-2012 | Ronan O'Gara | Ireland | 07-Mar-1977 | 35(200) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).