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Argentina's youngest players during the 1918 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 |
|---|---|---|---|
| Carlos Isola | 21:132 | 7803 | 18 Jul 1917v Uruguay |
| Ernesto Mattozzi | 22:59 | 8095 | 18 Jul 1917v Uruguay |