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Finland'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 |
|---|---|---|---|
| Markku Kanerva | 1:155 | 521 | 27 Oct 1965v West Germany |
| Tommy Lindholm | 18:186 | 6761 | 08 Aug 1965v Norway |
| Timo Kautonen | 20:149 | 7454 | 08 Aug 1965v Norway |
| Reijo Kanerva | 21:191 | 7862 | 08 Aug 1965v Norway |
| Lars Näsman | 22:25 | 8061 | 08 Aug 1965v Norway |
| Simo Syrjävaara | 22:55 | 8091 | 08 Aug 1965v Norway |
| Martti Halme | 22:205 | 8241 | 27 Oct 1965v West Germany |
| Reima Nummila | 22:265 | 8301 | 08 Aug 1965v Norway |
| Markku Hyvärinen | 23:76 | 8477 | 26 Jun 1966v England |
| Semi Nuoranen | 23:286 | 8687 | 26 Sep 1965v Poland |
| Pertti Mäkipää | 24:4 | 8770 | 08 Aug 1965v Norway |
| Rainer Aho | 24:189 | 8955 | 26 Jun 1966v England |
| Seppo Kilponen | 24:279 | 9045 | 26 Jun 1966v England |
| Aulis Laine | 26:38 | 9535 | 04 Jun 1966v Sweden |
| Matti Mäkelä | 26:206 | 9703 | 08 Aug 1965v Norway |
| Juhani Peltonen | 29:101 | 10694 | 26 Sep 1965v Poland |
| Kai Pahlman | 30:31 | 10989 | 08 Aug 1965v Norway |