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Portugal's oldest players during the 1978 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 given in days, and in years and days, from their date of birth.
| Player | Age (Y:d) | Age (days) | Match |
|---|---|---|---|
| Toni | 31:145 | 11468 | 08 Mar 1978v France |
| Botelho | 30:304 | 11262 | 08 Mar 1978v France |
| Alfredo Murça | 29:303 | 10896 | 16 Nov 1977v Cyprus |
| Bento | 29:255 | 10848 | 08 Mar 1978v France |
| Octávio Machado | 28:176 | 10403 | 29 Oct 1977v Poland |
| Chico Faria | 28:38 | 10265 | 16 Nov 1977v Cyprus |
| Artur Correia | 27:324 | 10186 | 08 Mar 1978v France |
| Nené | 27:323 | 10185 | 09 Oct 1977v Denmark |
| Humberto Coelho | 27:322 | 10184 | 08 Mar 1978v France |
| Manuel Fernandes | 26:276 | 9773 | 08 Mar 1978v France |
| João Cardoso | 26:162 | 9659 | 08 Mar 1978v France |
| João Laranjeira | 26:161 | 9658 | 08 Mar 1978v France |
| Oliveira | 25:270 | 9402 | 08 Mar 1978v France |
| João Alves | 25:92 | 9224 | 08 Mar 1978v France |
| Jordão | 25:60 | 9192 | 09 Oct 1977v Denmark |
| Costa | 24:128 | 8894 | 08 Mar 1978v France |
| Pietra | 23:260 | 8661 | 16 Nov 1977v Cyprus |
| Rodolfo | 23:253 | 8654 | 09 Oct 1977v Denmark |
| Gabriel Mendes | 23:152 | 8553 | 29 Oct 1977v Poland |
| Chalana | 18:279 | 6854 | 16 Nov 1977v Cyprus |