According to the IMDB profile for Aquaman, young actor Otis Dhanji has been cast to play 13 year old Arthur Curry in the movie.
There’s no question if the casting listing is correct, as the film is an origins movie and Dhanji looks a lot like a young Jason Momoa who’s playing adult Arthur/ Aquaman.
Not much is known of Dhanji, as he has no previous films listed on his IMDB profile nor is there any additional information shown on his profile.
Aquaman at the moment is in production in Queensland, Australia as confirmed by director James Wan and Warner Bros.
Aquaman is set to release in theaters on December 21, 2018.