The Little Mermaid follows Ariel as she embarks on a journey of self-discovery that ultimately ends in her getting married, which has led many to wonder how old Ariel is supposed to be in Disney's animated classic. First appearing in 1989, The Little Mermaid's Ariel is the latest Disney princess to receive the live-action remake treatment, with the new version hitting theaters on May 26th, 2023, and her age is being changed for the new version.
https://screenrant.com/how-old-is-ariel-in-the-little-mermaid/