| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 11-Jun-2021 | Scott Fardy | Australia | 05-Jul-1984 | 36(341) |
| 11-Jun-2021 | Michael Bent | Ireland | 25-Apr-1986 | 35(48) |
| 14-May-2021 | Sean Cronin | Ireland | 06-May-1986 | 35(9) |
| 11-Jun-2021 | Cian Healy | Ireland | 07-Oct-1987 | 33(248) |
| 14-May-2021 | David Kearney | Ireland | 19-Jun-1989 | 31(329) |
| 08-May-2021 | James Tracy | Ireland | 02-Apr-1991 | 30(37) |
| 11-Jun-2021 | Jamieson Gibson-Park | Ireland | 10-May-1992 | 29(32) |
| 24-Apr-2021 | James Lowe | Wales | 08-Jul-1992 | 28(290) |
| 08-May-2021 | Jack Conan | Ireland | 29-Jul-1992 | 28(283) |
| 14-May-2021 | Tadhg Furlong | Ireland | 14-Nov-1992 | 28(181) |
| 04-Jun-2021 | Luke McGrath | Ireland | 03-Feb-1993 | 28(121) |
| 04-Jun-2021 | Josh van der Flier | Ireland | 25-Apr-1993 | 28(40) |
| 14-May-2021 | Robbie Henshaw | Ireland | 12-Jun-1993 | 27(336) |
| 04-Jun-2021 | Edward Byrne | Ireland | 09-Sep-1993 | 27(268) |
| 11-Jun-2021 | Rory O'Loughlin | Ireland | 21-Jan-1994 | 27(141) |
| 04-Jun-2021 | Ross Moloney | Ireland | 11-May-1994 | 27(24) |
| 04-Jun-2021 | Cian Kelleher | Ireland | 07-Aug-1994 | 26(302) |
| 08-May-2021 | Peter Dooley | Ireland | 04-Aug-1994 | 26(278) |
| 11-Jun-2021 | Gary Ringrose | Ireland | 26-Jan-1995 | 26(137) |
| 04-Jun-2021 | Josh Murphy | Ireland | 07-Feb-1995 | 26(118) |
| 11-Jun-2021 | Ross Byrne | Ireland | 08-Apr-1995 | 26(65) |
| 08-May-2021 | Andrew Porter | Ireland | 16-Jan-1996 | 25(113) |
| 11-Jun-2021 | Hugo Keenan | Ireland | 18-Jun-1996 | 24(358) |
| 11-Jun-2021 | James Ryan | Ireland | 24-Jul-1996 | 24(322) |
| 11-Jun-2021 | Jimmy O'Brien | Ireland | 27-Nov-1996 | 24(196) |
| 11-Jun-2021 | Jordan Larmour | Ireland | 10-Jun-1997 | 24(1) |
| 08-May-2021 | Ciaran Frawley | Ireland | 04-Dec-1997 | 23(155) |
| 11-Jun-2021 | Ronan Kelleher | Ireland | 24-Jan-1998 | 23(138) |
| 11-Jun-2021 | Caelan Doris | Ireland | 02-Apr-1998 | 23(70) |
| 24-Apr-2021 | Hugh O'Sullivan | Ireland | 24-Feb-1998 | 23(59) |
| 24-Apr-2021 | Dan Sheehan | Ireland | 17-Sep-1998 | 22(220) |
| 24-Apr-2021 | Harry Byrne | Ireland | 22-Apr-1999 | 22(3) |
| 11-Jun-2021 | Ryan Baird | Ireland | 26-Jul-1999 | 21(321) |
| 11-Jun-2021 | Scott Penny | Ireland | 22-Sep-1999 | 21(263) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).