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Spain's youngest players during the 1986 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 |
|---|---|---|---|
| Eloy | 21:132 | 7803 | 20 Nov 1985v Austria |
| Butragueño | 22:65 | 8101 | 25 Sep 1985v Iceland |
| Míchel | 22:242 | 8278 | 20 Nov 1985v Austria |
| Francisco | 23:19 | 8420 | 20 Nov 1985v Austria |
| Salinas | 23:133 | 8534 | 22 Jan 1986v USSR |
| Zubizarreta | 23:337 | 8738 | 25 Sep 1985v Iceland |
| Chendo | 24:102 | 8868 | 22 Jan 1986v USSR |
| Marcos | 25:359 | 9491 | 25 Sep 1985v Iceland |
| Gallego | 26:229 | 9726 | 25 Sep 1985v Iceland |
| Calderé | 26:336 | 9833 | 18 Dec 1985v Bulgaria |
| Carrasco | 26:350 | 9847 | 19 Feb 1986v Belgium |
| Julio Alberto | 26:353 | 9850 | 25 Sep 1985v Iceland |
| Señor | 27:86 | 9948 | 20 Nov 1985v Austria |
| Maceda | 28:132 | 10359 | 25 Sep 1985v Iceland |
| Rincón | 28:150 | 10377 | 25 Sep 1985v Iceland |
| Víctor Muñoz | 28:194 | 10421 | 25 Sep 1985v Iceland |
| Gordillo | 28:213 | 10440 | 25 Sep 1985v Iceland |
| Gerardo | 28:313 | 10540 | 25 Sep 1985v Iceland |
| Sarabia | 28:343 | 10570 | 18 Dec 1985v Bulgaria |
| Goikoetxea | 29:32 | 10625 | 25 Sep 1985v Iceland |
| Camacho | 30:109 | 11067 | 25 Sep 1985v Iceland |