There are no age or nationality restrictions for participation.
The  COMPETITION sections include International Feature Film,
Latin American Feature Film, Mexican Short Film, Latin American Short Film and International   Short Film.
The production date  for participation in the feature film competition cannot be earlier than 2021.
 Works in languages other than Spanish must be submitted with Spanish subtitles.  If the film is spoken in Spanish, but not in Latin Spanish, it must contain subtitles in Spanish.

This is just an excerpt of the regulations, carefully read the complete regulations before submitting.