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Belgium'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 |
|---|---|---|---|
| Johnny Thio | 21:54 | 7725 | 27 Oct 1965v Bulgaria |
| Raoul Lambert | 21:181 | 7852 | 20 Apr 1966v France |
| Jan Verheyen | 21:281 | 7952 | 17 Apr 1966v Netherlands |
| Paul Van Himst | 21:359 | 8030 | 26 Sep 1965v Bulgaria |
| Wilfried Puis | 22:220 | 8256 | 26 Sep 1965v Bulgaria |
| Jean Trappeniers | 23:287 | 8688 | 27 Oct 1965v Bulgaria |
| Georges Heylens | 24:49 | 8815 | 26 Sep 1965v Bulgaria |
| Leon Semmeling | 25:265 | 9397 | 26 Sep 1965v Bulgaria |
| Lucien Spronck | 26:241 | 9738 | 17 Apr 1966v Netherlands |
| Yves Bare | 26:364 | 9861 | 27 Oct 1965v Bulgaria |
| Jef Jurion | 28:214 | 10441 | 26 Sep 1965v Bulgaria |
| Pierre Hanon | 28:271 | 10498 | 26 Sep 1965v Bulgaria |
| Paul Van den Berg | 28:350 | 10577 | 26 Sep 1965v Bulgaria |
| Frits Vandenboer | 31:347 | 11670 | 20 Apr 1966v France |