Indeed. I don't know much about this language, but the x86-64 OS written from scratch in crystal was one of the most impressive things I've seen during my time on HN [1]. In the thread about it [2], it was mentioned that the author was in high school.

[1] https://github.com/ffwff/lilith

[2] https://news.ycombinator.com/item?id=21860713