Highly dependent upon personality I'd say-- my DD loves helping other kids, and even at 9-10, she was thrilled to do this with her friends and classmates.
BUT-- she had the free time to burn, and she enjoyed it, and she has the right temperment for it. Not all people do.
Personally, I think it's been good for her to see what genuine struggle with a subject looks like, since she has major perfectionism issues and often incorrectly conflates growth with "struggle" herself.
With all of that said, though, she didn't start seriously tutoring math until she was 12 or so.
