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Guam's youngest players during the 2021 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 |
|---|---|---|---|
| Eduardo Pedemonte | 17:312 | 6522 | 30 May 2021v China PR |
| Kyle Halehale | 19:4 | 6944 | 07 Jun 2021v Syria |
| Leon Morimoto | 19:163 | 7103 | 30 May 2021v China PR |
| Anthony Moon | 19:228 | 7168 | 30 May 2021v China PR |
| Clayton Sato | 21:314 | 7985 | 30 May 2021v China PR |
| Devan Mendiola | 22:134 | 8170 | 30 May 2021v China PR |
| Shane Healy | 22:331 | 8367 | 30 May 2021v China PR |
| Isiah Lagutang | 23:300 | 8701 | 30 May 2021v China PR |
| Marlon Evans | 23:300 | 8701 | 30 May 2021v China PR |
| Shawn Aguigui | 24:298 | 9064 | 07 Jun 2021v Syria |
| Nate Lee | 27:24 | 9886 | 30 May 2021v China PR |
| Travis Nicklaw | 27:168 | 10030 | 07 Jun 2021v Syria |
| Dallas Jaye | 27:345 | 10207 | 30 May 2021v China PR |
| Marcus López | 29:110 | 10703 | 30 May 2021v China PR |
| Mark Chargualaf | 30:147 | 11105 | 30 May 2021v China PR |
| Alex Lee | 31:153 | 11476 | 07 Jun 2021v Syria |
| Justin Lee | 31:153 | 11476 | 07 Jun 2021v Syria |
| John Matkin | 35:48 | 12832 | 07 Jun 2021v Syria |
| Jason Cunliffe | 37:227 | 13742 | 07 Jun 2021v Syria |