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Costa Rica's oldest 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 given in days, and in years and days, from their date of birth.
| Player | Age (Y:d) | Age (days) | Match |
|---|---|---|---|
| Claudio Jara | 32:54 | 11742 | 29 Jun 1991v Guatemala |
| Roger Flores | 32:34 | 11722 | 29 Jun 1991v Guatemala |
| Luis Conejo | 31:179 | 11502 | 29 Jun 1991v Guatemala |
| Maurico Montero | 27:253 | 10115 | 29 Jun 1991v Guatemala |
| Hermidio Barrantes | 26:272 | 9769 | 02 Jun 1991v Guatemala |
| Hector Marchena | 26:175 | 9672 | 29 Jun 1991v Guatemala |
| Roger Gomez | 26:141 | 9638 | 29 Jun 1991v Guatemala |
| Vladimir Quezada | 25:47 | 9179 | 29 Jun 1991v Guatemala |
| Benjamín Mayorga | 24:253 | 9019 | 25 Jun 1991v Colombia |
| Hernan Medford | 23:36 | 8437 | 29 Jun 1991v Guatemala |
| Javier Delgado | 22:331 | 8367 | 25 Jun 1991v Colombia |
| Roy Myers | 22:72 | 8108 | 25 Jun 1991v Colombia |
| Juan Carlos Arguedas | 21:10 | 7681 | 14 May 1991v Uruguay |
| Ronald Gonzalez | 20:325 | 7630 | 29 Jun 1991v Guatemala |
| Austin Berry | 20:81 | 7386 | 25 Jun 1991v Colombia |
| Oscar Ramirez | 16:203 | 6047 | 29 Jun 1991v Guatemala |