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Spain's youngest players during the 1965 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 measured in days, and in years and days, from their date of birth to the day of their first appearance.
| Player | Age (Y:d) | Age (days) | Match |
|---|---|---|---|
| Iríbar | 21:259 | 7930 | 15 Nov 1964v Portugal |
| Glaría | 23:123 | 8524 | 05 May 1965v Republic of Ireland |
| Fuste | 23:214 | 8615 | 15 Nov 1964v Portugal |
| Guillot | 23:294 | 8695 | 05 May 1965v Republic of Ireland |
| José Ufarte | 23:353 | 8754 | 05 May 1965v Republic of Ireland |
| Marcelino | 24:200 | 8966 | 15 Nov 1964v Portugal |
| Amancio | 25:30 | 9162 | 15 Nov 1964v Portugal |
| Zoco | 25:107 | 9239 | 15 Nov 1964v Portugal |
| Adelardo | 25:221 | 9353 | 05 May 1965v Republic of Ireland |
| Lapetra | 25:351 | 9483 | 15 Nov 1964v Portugal |
| Reija | 25:355 | 9487 | 15 Nov 1964v Portugal |
| Luis Maria Aguirre | 26:11 | 9508 | 08 May 1965v Scotland |
| Villa | 26:50 | 9547 | 15 Nov 1964v Portugal |
| Pereda | 26:153 | 9650 | 15 Nov 1964v Portugal |
| Aragonés | 26:284 | 9781 | 08 May 1965v Scotland |
| Rivilla | 28:86 | 10313 | 15 Nov 1964v Portugal |
| Olivella | 28:146 | 10373 | 15 Nov 1964v Portugal |