| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 17-Mar-2012 | Donncha O'Callaghan | Ireland | 24-Mar-1979 | 32(359) |
| 04-Mar-2012 | Paul O'Connell | Ireland | 20-Oct-1979 | 32(136) |
| 17-Mar-2012 | Mike Ross | Ireland | 21-Dec-1979 | 32(87) |
| 17-Mar-2012 | Gordon D'Arcy | Ireland | 10-Feb-1980 | 32(36) |
| 17-Mar-2012 | Eion Redden | Ireland | 20-Nov-1980 | 31(117) |
| 17-Mar-2012 | Rory Best | Ireland | 15-Aug-1982 | 29(215) |
| 17-Mar-2012 | Robert Kearney | Ireland | 26-Mar-1983 | 28(357) |
| 17-Mar-2012 | Donnacha Ryan | Ireland | 11-Dec-1983 | 28(97) |
| 17-Mar-2012 | James Heaslip | Ireland | 15-Dec-1983 | 28(93) |
| 17-Mar-2012 | Tommy Bowe | Ireland | 22-Feb-1984 | 28(24) |
| 17-Mar-2012 | Andrew Trimble | Ireland | 20-Oct-1984 | 27(148) |
| 17-Mar-2012 | Jonathan Sexton | Ireland | 11-Jul-1985 | 26(250) |
| 17-Mar-2012 | Stephen Ferris | Ireland | 02-Aug-1985 | 26(228) |
| 05-Feb-2012 | Fergus McFaddon | Ireland | 17-Jun-1986 | 25(233) |
| 17-Mar-2012 | Sean O'Brien | Ireland | 14-Feb-1987 | 25(32) |
| 17-Mar-2012 | Keith Earls | Ireland | 02-Oct-1987 | 24(167) |
| 17-Mar-2012 | Cian Healy | Ireland | 07-Oct-1987 | 24(162) |
| 04-Mar-2012 | Conor Murray | Ireland | 20-Apr-1989 | 22(319) |
| 10-Mar-2012 | Peter O'Mahony | Ireland | 17-Sep-1989 | 22(175) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).