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Republic of Ireland's oldest players during the 1966 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 |
|---|---|---|---|
| Noel Cantwell | 33:147 | 12201 | 25 May 1966v Belgium |
| Mick Meagan | 31:361 | 11684 | 25 May 1966v Belgium |
| Joe Haverty | 30:97 | 11055 | 25 May 1966v Belgium |
| Mick McGrath | 30:47 | 11005 | 25 May 1966v Belgium |
| Alan Kelly | 29:323 | 10916 | 25 May 1966v Belgium |
| Charlie Hurley | 29:232 | 10825 | 25 May 1966v Belgium |
| Theo Foley | 29:31 | 10624 | 04 May 1966v Germany |
| Shay Brennan | 29:18 | 10611 | 25 May 1966v Belgium |
| Andy McEvoy | 27:118 | 9980 | 10 Nov 1965v Spain |
| Johnny Fullam | 26:63 | 9560 | 25 May 1966v Belgium |
| Frank O'Neill | 26:38 | 9535 | 22 May 1966v Austria |
| Johnny Giles | 25:199 | 9331 | 25 May 1966v Belgium |
| Tony Dunne | 24:305 | 9071 | 25 May 1966v Belgium |
| Pat Dunne | 23:84 | 8485 | 04 May 1966v Germany |
| Eamonn Dunphy | 20:274 | 7579 | 04 May 1966v Germany |
| Ray Treacy | 19:320 | 7260 | 04 May 1966v Germany |