Editing Old (2021) (section)

=== Filming and post-production ===
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On September 26, 2020, principal photography began in the Dominican Republic, and to celebrate, Shyamalan revealed the film's title and published its first promotional release poster. That same day, ''Collider'' reported that the film was an adaptation of ''Sandcastle'', the French graphic novel by Swiss authors Pierre Oscar Levy and Frederik Peeters, which Shyamalan had received as a collective Father's Day gift from his three daughters in 2017. ''Old'' marks the first film of Shyamalan's career to have no shooting take place around his hometown of Philadelphia, Pennsylvania. With an $18 million budget, filming took place during the COVID-19 pandemic with cinematographer Michael Gioulakis, using 35mm film, and concluded on November 15, 2020. After filming wrapped, Shyamalan said ''Old'' was the first film to be shot during the pandemic in the Dominican Republic and that, throughout the shoot, no one tested positive for the virus as he paid for the production crew's ten-week stay at a hotel.

''Old'' was inspired by films created during the Australian New Wave, including ''Walkabout'' (1971) and ''Picnic at Hanging Rock'' (1975), along with ''The Exterminating Angel'' (1962), ''Kuroneko'' (1968), ''Jaws'' (1975), and ''The Twilight Zone''. To create a claustrophobic feeling, Shyamalan employed several filming techniques from Akira Kurosawa's ''Rashomon'' (1950) and ''Ran'' (1985). As a result, ''Old'' was mostly filmed in a single location, the Playa El Valle beach located between two mountains on the north coast of Santa Bárbara de Samaná. Additional filming took place at Pinewood Dominican Republic Studios in Juan Dolio and in several locations around Samaná. To capture footage of the surrounding nature, Shyamalan's daughter, Ishana, served as the film's second unit director. His other daughter, Saleka Shyamalan, wrote an original song for the film titled "Remain" that was inspired by the topic of marriage vows and U2's "With or Without You," used to "highlight the relationship between Guy and Prisca and the love that exists between them."

Several cast members recalled Shyamalan using storyboards to frame every shot in the film. Ishana Shyamalan described her father's choice as a "very prescribed and programmatic" approach, while Wolff said the director "had such precision in terms of what age he wanted you to be and where he wanted you to be at that age. Night would just guide you where you needed to be emotionally, and then it would happen naturally." Wolff said he and McKenzie were the first actors to be cast after submitting audition tapes, and recalled passing out during the filming of the pregnancy scene due to high temperatures. During post-production, editing was completed by Brett M. Reed. The film's score was composed by Trevor Gureckis and released by Back Lot Music on July 23, 2021.