Ask Mr. Rules Book
Which is the youngest age you can compete in an IDO competition?
from Beverly (South Africa)Beverly’s question: Please can you clarify for what is the youngest age you can compete in an IDO competition is it 9 years or 8 years?
Bill’s answer: There is no rule regarding how young. The rule is Children's division is 11 and under. (There is another rule which allows an organizer to have an age category 6 and under if they so wish, but the general rule is 11 and under.)