In my elementary school everyone was required to learn to play the recorder.
I think it’s kind of young to start instruments in elementary school. I started to learn to play the violin in middle school. I’d say that that’s a good time to start learning instruments. They just seem hard to grasp for elementary school minds. (Some not all) Also depends of if the kid wants to learn the instrument or is being pushed by a parent/teacher.
Recorder was a fairly easy one to learn, violin is much more complicated. Children tend to have short attention spans to.