I could not find a more recent article...

http://www.espn.com/espnw/culture/the-buzz/article/19336629/yes-hobbyhorse-championships-somehow-real-thing

Except for this, it can be read in the non-private mode:

https://www.nytimes.com/2019/04/21/world/europe/finland-hobbyhorse-girls.html

And what is most important, there are younger girls than these who are hobbyhorse enthusiasts.