| Player | Pos | Age | Opposition | Ground | Date | Match | |
|---|---|---|---|---|---|---|---|
| GV Stephenson | C | 22y 315d | v New Zealand | Lansdowne Road | 1 Nov 1924 | Details | |
| JKS Thompson | F | 24y 210d | v England | Leicester | 10 Feb 1923 | Details | |
| EO Davy | FH | 24y 212d | v Scotland | Lansdowne Road | 23 Feb 1929 | Details | |
| WD Doherty | F | 26y 226d | v Scotland | Inverleith | 28 Feb 1920 | Details | |
| WP Collopy | P | 27y 282d | v England | Lansdowne Road | 11 Feb 1922 | Details | |
| TH Wallace | C | 27y 323d | v Wales | Cardiff | 13 Mar 1920 | Details | |
| RA Lloyd | FH | 28y 194d | v England | Lansdowne Road | 14 Feb 1920 | Details | |
| WE Crawford | FB | 32y 70d | v France | Lansdowne Road | 26 Jan 1924 | Details |
Only the player's first appearance listed
| Records include the following current or recent matches: |
|
Ireland v Wales at Belfast, Five Nations, Mar 9, 1929 [5-5 FT] |
|
Ireland v Scotland at Lansdowne Road, Five Nations, Feb 23, 1929 [7-16 FT] |
|
Ireland v England at Lansdowne Road, Five Nations, Feb 11, 1928 [6-7 FT] |