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Bulgaria's youngest players during the 1957 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 |
|---|---|---|---|
| Georgi 'Gocho' Vasilev | 11:78 | 4096 | 26 Aug 1956v Poland |
| Alexandar D Kostov | 19:110 | 7050 | 23 Jun 1957v Hungary |
| Nikola Kovachev | 22:83 | 8119 | 26 Aug 1956v Poland |
| Todor Diev | 22:210 | 8246 | 26 Aug 1956v Poland |
| Kiril Rakarov | 24:94 | 8860 | 26 Aug 1956v Poland |
| Iliya Kirchev | 24:177 | 8943 | 23 Jun 1957v Hungary |
| Georgi Naydenov | 24:249 | 9015 | 26 Aug 1956v Poland |
| Panayot Panayotov | 25:239 | 9371 | 26 Aug 1956v Poland |
| Ivan Kolev | 25:298 | 9430 | 26 Aug 1956v Poland |
| Manol Manolov | 31:18 | 11341 | 26 Aug 1956v Poland |