The age of criminal responsibility is a big issue in Australia at the moment, especially in Queensland, with kids as young as 10 being locked up for long periods of time, often in isolation. It's not exactly the same, but it's your exact age group and it has been researched.
(no subject)
Date: 2025-04-03 07:40 am (UTC)https://www.unsw.edu.au/newsroom/news/2019/06/locking-kids-damages-their-mental-health-and-leads-more-disadvantage
This article has a lot of links to that kind of study.