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Northern Ireland's oldest players during the 1964 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 |
|---|---|---|---|
| Billy Bingham | 32:107 | 11795 | 20 Nov 1963v England |
| Harry Gregg | 31:23 | 11346 | 20 Nov 1963v England |
| Billy McCullough | 28:277 | 10504 | 29 Apr 1964v Uruguay |
| Jimmy Hill | 28:20 | 10247 | 20 Nov 1963v England |
| Billy Humphries | 27:164 | 10026 | 20 Nov 1963v England |
| Samuel Wilson | 27:150 | 10012 | 29 Apr 1964v Uruguay |
| Bobby Braithwaite | 27:64 | 9926 | 29 Apr 1964v Uruguay |
| Victor Hunter | 26:301 | 9798 | 30 Oct 1963v Spain |
| John Parke | 26:105 | 9602 | 20 Nov 1963v England |
| Johnny Crossan | 25:151 | 9283 | 29 Apr 1964v Uruguay |
| Jimmy Magill | 24:348 | 9114 | 29 Apr 1964v Uruguay |
| James McLaughlin | 23:128 | 8529 | 29 Apr 1964v Uruguay |
| Alex Elder | 23:4 | 8405 | 29 Apr 1964v Uruguay |
| Martin Harvey | 22:222 | 8258 | 29 Apr 1964v Uruguay |
| Terry Neill | 21:356 | 8027 | 29 Apr 1964v Uruguay |
| Pat Jennings | 18:321 | 6896 | 29 Apr 1964v Uruguay |
| George Best | 17:342 | 6552 | 29 Apr 1964v Uruguay |