Interesting, because the creator of Supermemo wrote that Spaced Repetition doesn't work on children because their brain re-arranges and repurposes structures far too much, making children's forgetting curve far too unpredictable, or at least different from adults.
https://supermemo.guru/wiki/SuperMemo_does_not_work_for_kids
Spaced repetition flaschard software is all about scheduling the flashcards around predictions of your forgetting curve, and Anki and Supermemo are designed for the forgetting curves of adults.