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Bulgaria's youngest players during the 1964 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 Asparoukov | 20:148 | 7453 | 29 Sep 1963v France |
| Dobromir Zhechev | 20:321 | 7626 | 29 Sep 1963v France |
| Aleksandar Shalamanov | 22:24 | 8060 | 29 Sep 1963v France |
| Dimitar Yakimov | 22:78 | 8114 | 29 Sep 1963v France |
| Petar Velichkov | 23:51 | 8452 | 29 Sep 1963v France |
| Ivan Vutzov | 23:289 | 8690 | 29 Sep 1963v France |
| Stoyan Kitov | 25:32 | 9164 | 29 Sep 1963v France |
| Georgi Naydenov | 27:244 | 10106 | 29 Sep 1963v France |
| Ivan Dimitrov | 28:138 | 10365 | 29 Sep 1963v France |
| Vasil Metodiev | 28:293 | 10520 | 26 Oct 1963v France |
| Stefan Abadzhiev | 29:114 | 10707 | 26 Oct 1963v France |
| Todor Diev | 29:243 | 10836 | 29 Sep 1963v France |
| Ivan Kolev | 32:332 | 12020 | 29 Sep 1963v France |