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Spain's youngest players during the 1951 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 |
|---|---|---|---|
| Juan Segarra | 23:214 | 8615 | 17 Jun 1951v Sweden |
| Estanislao Basora | 24:92 | 8858 | 18 Feb 1951v Switzerland |
| Alfonso Silva | 24:336 | 9102 | 18 Feb 1951v Switzerland |
| Antonio Puchades | 25:258 | 9390 | 18 Feb 1951v Switzerland |
| Luis Molowny | 25:281 | 9413 | 18 Feb 1951v Switzerland |
| Jose Parra | 25:285 | 9417 | 10 Jun 1951v Belgium |
| Gabriel Alonso | 27:213 | 10075 | 10 Jun 1951v Belgium |
| Francisco Antunez | 28:109 | 10336 | 18 Feb 1951v Switzerland |
| Agustin Gainza | 28:266 | 10493 | 18 Feb 1951v Switzerland |
| Mariano Gonzalvo III | 29:79 | 10672 | 10 Jun 1951v Belgium |
| Jose Luis Lopez Panizo | 29:123 | 10716 | 10 Jun 1951v Belgium |
| Zarra | 30:28 | 10986 | 18 Feb 1951v Switzerland |
| Ignacio Eizaguirre | 30:102 | 11060 | 18 Feb 1951v Switzerland |