What age and skill level is considered a junior rider?

for my circuit a junior is under 18 and can be any skill level (not pro)
Thank you!
Junior rider is from 14 to 18 years old. I think international junior classes go up to 145cm? But at least in my country you don't have to jump that high, if your age is between 14-18 you are considered as a junior rider :)
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