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Spain's youngest players during the 1931 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 |
|---|---|---|---|
| José Iraragorri | 19:33 | 6973 | 19 Apr 1931v Italy |
| Chirri II | 21:203 | 7874 | 30 Nov 1930v Portugal |
| Guillermo Gorostiza | 21:287 | 7958 | 30 Nov 1930v Portugal |
| Luis Regueiro | 22:151 | 8187 | 30 Nov 1930v Portugal |
| Lafuente | 22:334 | 8370 | 30 Nov 1930v Portugal |
| Martin Marculeta | 23:207 | 8608 | 19 Apr 1931v Italy |
| Jacinto Fernandez Quincoces | 25:135 | 9267 | 30 Nov 1930v Portugal |
| Ciriaco Errasti | 26:113 | 9610 | 30 Nov 1930v Portugal |
| José Samitier | 29:82 | 10675 | 26 Apr 1931v Republic of Ireland |
| Ricardo Zamora | 30:87 | 11045 | 19 Apr 1931v Italy |