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Costa Rica's youngest players during the 1991 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 |
|---|---|---|---|
| Oscar Ramirez | 16:157 | 6001 | 14 May 1991v Uruguay |
| Austin Berry | 20:81 | 7386 | 25 Jun 1991v Colombia |
| Ronald Gonzalez | 20:321 | 7626 | 25 Jun 1991v Colombia |
| Juan Carlos Arguedas | 21:10 | 7681 | 14 May 1991v Uruguay |
| Roy Myers | 22:30 | 8066 | 14 May 1991v Uruguay |
| Javier Delgado | 22:331 | 8367 | 25 Jun 1991v Colombia |
| Hernan Medford | 23:32 | 8433 | 25 Jun 1991v Colombia |
| Benjamín Mayorga | 24:253 | 9019 | 25 Jun 1991v Colombia |
| Vladimir Quezada | 25:1 | 9133 | 14 May 1991v Uruguay |
| Roger Gomez | 26:95 | 9592 | 14 May 1991v Uruguay |
| Hector Marchena | 26:129 | 9626 | 14 May 1991v Uruguay |
| Hermidio Barrantes | 26:265 | 9762 | 26 May 1991v Honduras |
| Maurico Montero | 27:207 | 10069 | 14 May 1991v Uruguay |
| Luis Conejo | 31:175 | 11498 | 25 Jun 1991v Colombia |
| Roger Flores | 31:353 | 11676 | 14 May 1991v Uruguay |
| Claudio Jara | 32:8 | 11696 | 14 May 1991v Uruguay |