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Czechoslovakia's youngest players during the 1966 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 |
|---|---|---|---|
| Ladislav Kuna | 19:45 | 6985 | 18 May 1966v USSR |
| Juarj Szikora | 19:77 | 7017 | 18 May 1966v USSR |
| Karol Jokl | 20:21 | 7326 | 19 Sep 1965v Romania |
| Dušan Kabát | 21:49 | 7720 | 09 Oct 1965v Turkey |
| Alexander Vencel | 21:223 | 7894 | 19 Sep 1965v Romania |
| František Veselý | 21:286 | 7957 | 19 Sep 1965v Romania |
| Ivan Hrdlicka | 21:303 | 7974 | 19 Sep 1965v Romania |
| Stanislav Strunc | 23:225 | 8626 | 12 Jun 1966v Brazil |
| Ivo Viktor | 24:22 | 8788 | 12 Jun 1966v Brazil |
| Jozef Adamec | 24:81 | 8847 | 18 May 1966v USSR |
| Jozef Bomba | 26:173 | 9670 | 19 Sep 1965v Romania |
| Alexander Horváth | 26:285 | 9782 | 09 Oct 1965v Turkey |
| Vojtech Masny | 27:73 | 9935 | 19 Sep 1965v Romania |
| Jan Lála | 29:8 | 10601 | 19 Sep 1965v Romania |
| Andrej Kvašňák | 29:122 | 10715 | 19 Sep 1965v Romania |
| Ján Popluhár | 30:38 | 10996 | 19 Sep 1965v Romania |
| Josef Vojta | 31:29 | 11352 | 18 May 1966v USSR |
| Ladislav Novak | 34:164 | 12583 | 18 May 1966v USSR |
| Josef Masopust | 35:98 | 12882 | 18 May 1966v USSR |