| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 19-Mar-2021 | Scott Fardy | Australia | 05-Jul-1984 | 36(257) |
| 23-Jan-2021 | Jonathan Sexton | Ireland | 11-Jul-1985 | 35(197) |
| 19-Mar-2021 | Michael Bent | Ireland | 25-Apr-1986 | 34(329) |
| 19-Mar-2021 | Sean Cronin | Ireland | 06-May-1986 | 34(318) |
| 19-Mar-2021 | Devin Toner | Ireland | 29-Jun-1986 | 34(264) |
| 23-Jan-2021 | Cian Healy | Ireland | 07-Oct-1987 | 33(109) |
| 19-Mar-2021 | David Kearney | Ireland | 19-Jun-1989 | 31(273) |
| 06-Mar-2021 | Rhys Ruddock | Ireland | 13-Oct-1990 | 30(145) |
| 06-Mar-2021 | James Tracy | Ireland | 02-Apr-1991 | 29(339) |
| 08-Jan-2021 | Jamieson Gibson-Park | Ireland | 10-May-1992 | 28(243) |
| 19-Feb-2021 | Jack Conan | Ireland | 29-Jul-1992 | 28(205) |
| 10-Oct-2020 | James Lowe | Wales | 08-Jul-1992 | 28(94) |
| 30-Jan-2021 | Tadhg Furlong | Ireland | 14-Nov-1992 | 28(77) |
| 12-Mar-2021 | Luke McGrath | Ireland | 03-Feb-1993 | 28(37) |
| 06-Mar-2021 | Josh van der Flier | Ireland | 25-Apr-1993 | 27(315) |
| 23-Jan-2021 | Robbie Henshaw | Ireland | 12-Jun-1993 | 27(225) |
| 06-Mar-2021 | Edward Byrne | Ireland | 09-Sep-1993 | 27(178) |
| 19-Mar-2021 | Rory O'Loughlin | Ireland | 21-Jan-1994 | 27(57) |
| 19-Mar-2021 | Ross Moloney | Ireland | 11-May-1994 | 26(313) |
| 30-Jan-2021 | Dan Leavy | Ireland | 23-May-1994 | 26(253) |
| 19-Mar-2021 | Peter Dooley | Ireland | 04-Aug-1994 | 26(228) |
| 12-Mar-2021 | Cian Kelleher | Ireland | 07-Aug-1994 | 26(218) |
| 19-Mar-2021 | Josh Murphy | Ireland | 07-Feb-1995 | 26(41) |
| 23-Jan-2021 | Gary Ringrose | Ireland | 26-Jan-1995 | 25(363) |
| 06-Mar-2021 | Ross Byrne | Ireland | 08-Apr-1995 | 25(333) |
| 23-Jan-2021 | Andrew Porter | Ireland | 16-Jan-1996 | 25(8) |
| 23-Jan-2021 | Will Connors | Ireland | 04-Apr-1996 | 24(294) |
| 23-Jan-2021 | Hugo Keenan | Ireland | 18-Jun-1996 | 24(219) |
| 23-Jan-2021 | James Ryan | Ireland | 24-Jul-1996 | 24(183) |
| 19-Mar-2021 | Rowan Osbourne | Ireland | 03-Nov-1996 | 24(136) |
| 12-Mar-2021 | Jimmy O'Brien | Ireland | 27-Nov-1996 | 24(105) |
| 23-Jan-2021 | Jordan Larmour | Ireland | 10-Jun-1997 | 23(227) |
| 19-Mar-2021 | Ciaran Frawley | Ireland | 04-Dec-1997 | 23(105) |
| 23-Jan-2021 | Caelan Doris | Ireland | 02-Apr-1998 | 22(297) |
| 08-Nov-2020 | Tommy O'Brien | Ireland | 20-Feb-1998 | 22(262) |
| 02-Oct-2020 | Ronan Kelleher | Ireland | 24-Jan-1998 | 22(252) |
| 12-Mar-2021 | Dan Sheehan | Ireland | 17-Sep-1998 | 22(177) |
| 12-Mar-2021 | Jack Dunne | Ireland | 21-Nov-1998 | 22(112) |
| 19-Mar-2021 | Harry Byrne | Ireland | 22-Apr-1999 | 21(332) |
| 19-Feb-2021 | Ryan Baird | Ireland | 26-Jul-1999 | 21(209) |
| 30-Jan-2021 | Liam Turner | Ireland | 22-Jul-1999 | 21(193) |
| 19-Mar-2021 | Scott Penny | Ireland | 22-Sep-1999 | 21(179) |
| 19-Mar-2021 | Max O'Reilly | Ireland | 26-Feb-2000 | 21(22) |
| 12-Mar-2021 | Tom Clarkson | Ireland | 22-Feb-2000 | 21(19) |
| 08-Nov-2020 | Michael Milne | Ireland | 05-Feb-2000 | 20(277) |
| 02-Jan-2021 | Andrew Smith | Ireland | 21-Jul-2000 | 20(165) |
| 12-Mar-2021 | Alex Soroka | Ireland | 19-Feb-2001 | 20(21) |
| 19-Mar-2021 | Jamie Osborne | Ireland | 16-Nov-2001 | 19(123) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).