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Republic of Ireland's oldest players during the 1974 season, and their age in years and days on the occasion of their final appearance, starting or coming on as a substitute.
For each player age is given in days, and in years and days, from their date of birth.
| Player | Age (Y:d) | Age (days) | Match |
|---|---|---|---|
| Alfie Hale | 34:54 | 12473 | 21 Oct 1973v Poland |
| Johnny Giles | 33:186 | 12240 | 12 May 1974v Chile |
| Tony Dunne | 32:292 | 11980 | 12 May 1974v Chile |
| Terry Mancini | 31:220 | 11543 | 12 May 1974v Chile |
| Paddy Mulligan | 29:55 | 10648 | 12 May 1974v Chile |
| Eoin Hand | 28:43 | 10270 | 12 May 1974v Chile |
| Ray Treacy | 27:321 | 10183 | 05 May 1974v Brazil |
| Jimmy Conway | 27:275 | 10137 | 12 May 1974v Chile |
| Tony Byrne | 27:261 | 10123 | 21 Oct 1973v Poland |
| Terry Conroy | 27:222 | 10084 | 12 May 1974v Chile |
| Joe Kinnear | 27:136 | 9998 | 12 May 1974v Chile |
| Don Givens | 24:276 | 9042 | 12 May 1974v Chile |
| Miah Dennehy | 23:206 | 8607 | 21 Oct 1973v Poland |
| Mick Kearns | 23:167 | 8568 | 12 May 1974v Chile |
| Mick Martin | 22:307 | 8343 | 12 May 1974v Chile |
| Jimmy Holmes | 20:175 | 7480 | 05 May 1974v Brazil |
| Gerry Daly | 20:8 | 7313 | 08 May 1974v Uruguay |