Short films must have a maximum running time of 20 minutes (including
credits).
The central theme of the film must relate to older people, ageing, old age and/or intergenerational dialogue, addressing
one of the thematic areas proposed by the festival.
Films of any nationality produced on or after 1 January 2020 may be submitted.
Short films must be submitted in their original language. If the language is not Spanish, they must include Spanish subtitles.
Each director or production company may submit a maximum of two films.

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