| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 26-Aug-2023 | Cian Healy | Ireland | 07-Oct-1987 | 35(324) |
| 05-Aug-2023 | Keith Earls | Ireland | 02-Oct-1987 | 35(308) |
| 05-Aug-2023 | Dave Kilcoyne | Ireland | 14-Dec-1988 | 34(234) |
| 26-Aug-2023 | Conor Murray | Ireland | 20-Apr-1989 | 34(128) |
| 19-Aug-2023 | Peter O'Mahony | Ireland | 17-Sep-1989 | 33(336) |
| 19-Aug-2023 | Bundee Aki | Ireland | 07-Apr-1990 | 33(134) |
| 05-Aug-2023 | Robert Herring | Ireland | 27-Apr-1990 | 33(100) |
| 26-Aug-2023 | Finley Bealham | Ireland | 09-Oct-1991 | 31(321) |
| 26-Aug-2023 | Iain Henderson | Ireland | 21-Feb-1992 | 31(186) |
| 19-Aug-2023 | Jamieson Gibson-Park | Ireland | 10-May-1992 | 31(101) |
| 19-Aug-2023 | James Lowe | Wales | 08-Jul-1992 | 31(41) |
| 26-Aug-2023 | Tadhg Beirne | Ireland | 01-Aug-1992 | 31(25) |
| 26-Aug-2023 | Stuart McCloskey | Ireland | 06-Aug-1992 | 31(20) |
| 05-Aug-2023 | Jack Conan | Ireland | 29-Jul-1992 | 31(7) |
| 19-Aug-2023 | Tadhg Furlong | Ireland | 14-Nov-1992 | 30(278) |
| 26-Aug-2023 | Josh van der Flier | Ireland | 25-Apr-1993 | 30(123) |
| 26-Aug-2023 | Robbie Henshaw | Ireland | 12-Jun-1993 | 30(75) |
| 19-Aug-2023 | Gary Ringrose | Ireland | 26-Jan-1995 | 28(205) |
| 19-Aug-2023 | Ross Byrne | Ireland | 08-Apr-1995 | 28(133) |
| 19-Aug-2023 | Andrew Porter | Ireland | 16-Jan-1996 | 27(215) |
| 26-Aug-2023 | Jacob Stockdale | Ireland | 03-Apr-1996 | 27(144) |
| 19-Aug-2023 | Hugo Keenan | Ireland | 18-Jun-1996 | 27(61) |
| 19-Aug-2023 | James Ryan | Ireland | 24-Jul-1996 | 27(25) |
| 26-Aug-2023 | Jimmy O'Brien | Ireland | 27-Nov-1996 | 26(272) |
| 26-Aug-2023 | Mackenzie Hansen | Ireland | 27-Mar-1998 | 25(152) |
| 26-Aug-2023 | Caelan Doris | Ireland | 02-Apr-1998 | 25(146) |
| 19-Aug-2023 | Dan Sheehan | Ireland | 17-Sep-1998 | 24(336) |
| 05-Aug-2023 | Tom O'Toole | Ireland | 23-Sep-1998 | 24(316) |
| 05-Aug-2023 | Craig Casey | Ireland | 19-Apr-1999 | 24(108) |
| 26-Aug-2023 | Ryan Baird | Ireland | 26-Jul-1999 | 24(31) |
| 26-Aug-2023 | Jack Crowley | Ireland | 13-Jan-2000 | 23(225) |
| 19-Aug-2023 | Cian Prendergast | Ireland | 23-Feb-2000 | 23(177) |
| 26-Aug-2023 | Tom Stewart | Ireland | 11-Jan-2001 | 22(227) |
| 05-Aug-2023 | Joe McCarthy | Ireland | 26-Mar-2001 | 22(132) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).